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# Topic: Subtraction

 Subtracting/subtraction facts basics,story problems,2-digit - - games, worksheets for kindergarten, first,second grades Subtraction & Addition with Three Numbers and with parenthesis Addition and Subtraction with Three Numbers and with Parenthesis Lots of sites on the Internet use it, so if you haven't got it already, please download shockwave. www.dositey.com /addsub/subtraction.htm   (96 words)

 Subtraction - Enchanted Learning Subtraction is considered to be a binary operation because it is performed on two numbers. In subtraction, you start on the right (the ones column), and subtract each column in turn until you are done (subtracting the tens column, then the hundreds column, etc.). In a column, if the digit you are subtracting (in the subtrahend) is bigger than the digit you are subtracting from (in the minuend), you have to borrow a one from the next column to the left (the borrowed digit is a ten in the column to the right). www.enchantedlearning.com /math/subtract   (716 words)

 PlanetMath: subtraction   (Site not responding. Last check: ) Subtraction is a mathematical operation in which the value of a number is decreased by the values of one or more other numbers. Subtraction can be seen as a kind of addition with negative numbers. Besides the possibility of overflow or underflow, subtraction presents no problems for fixed point arithmetic provided the operands are representable in fixed point to begin with. planetmath.org /encyclopedia/Subtraction.html   (154 words)

 Subtraction | World of Mathematics By treating subtraction of one number from another (a - b) as simply the addition of the number "a" with the additive inverse of "b" (that is, a + (-b)), the additive laws of arithmetic may be applied. Subtraction on vectors is performed by defining the negative of a vector as being equal to a vector of equal magnitude but opposite direction. Subtraction on matrices is valid only if each of the matrices to be subtracted is of the same order (contain the same number of rows and columns). www.bookrags.com /research/subtraction-wom   (897 words)

 Checking Subtraction (I) In figure 1, the original subtraction is carried out by using the "Borrow Method." The same subtraction is then performed by using the "Carry Method." Since the answers obtained by both these methods match, the subtraction is correct. Another way of checking subtraction is adding the remainder to the subtrahend and confirming whether this sum is equal to the minuend. Calculate the remainder of nine for the remainder of the subtraction. www.suite101.com /article.cfm/math_fun/90479   (359 words)

 Subtraction Summary Subtraction is one of the four basic arithmetic operations; it is essentially the opposite of addition. In mathematics, it is often useful to view or even define subtraction as a kind of addition, the addition of the opposite. Subtraction is not associative or commutative— in fact, it is anticommutative— but addition of signed numbers is both. www.bookrags.com /Subtraction   (1428 words)

 Illuminations: Take Away A subtraction mat - a 9 * 12 sheet of paper in the center of which is drawn a circle large enough to hold all the counters Materials: Ten counters for each child; a subtraction mat - a 9 * 12 sheet of paper in the center of which is drawn a circle large enough to hold all the counters. As in the previous lesson, a child is asked to invent a subtraction story problem for the rest of the class to solve. illuminations.nctm.org /index_d.aspx?id=192   (2279 words)

 Review of Subtraction Facts When you are subtracting 1, 2, 3, or 4 from a number, begin with the top number and count down the bottom number of times. When you are subtracting five from a two-digit basic fact, you just add the numerals in the one's place...(ex. When you are subtracting 6, 7, or 8 from basic facts, take the 6, 7, or 8 and count up to the top (larger) number. www.glc.k12.ga.us /BuilderV03/LPTools/LPShared/lpdisplay.asp?LPID=15836   (739 words)

 The Abacus: Subtraction Subtraction is performed by first registering the minuend and then subtracting, starting from the left, by removing beads from either or both the lower or upper decks. When the number of beads in the lower deck is less than the subtracter (the number being subtracted), one or more beads are added in the lower deck and 1 bead is removed from the upper-deck. Example: When subtracting 4 (+1-5 = -4) from 7 (represented by 1 bead in the upper-deck and 2 beads in the lower deck (less than 4, the subtracter), one bead is added to the lower deck (+1) and 1 bead is removed from the upper-deck (-5) leaving 3 beads, representing the result. www.ee.ryerson.ca:8080 /~elf/abacus/asubtraction.html   (331 words)

 Addition and Subtraction of Signed Numbers Addition and Subtraction of Signed Numbers David Drymiller Morgan Park High School 10115 S. Oakley 1744 W. Pryor Chicago IL 60643 Chicago IL 60643 312-233-7902 312-535-2550 Objective(s): To master the addition and subtraction of signed numbers. Explain that they had to add or subtract positive and negative numbers to answer the questions. For any addition or subtraction problem only one sign is necessary between each number in order to know what to do. www.iit.edu /~smile/ma9207.html   (630 words)

 Income Tax - Colorado Source Capital Gain Subtraction   (Site not responding. Last check: ) The expanded subtraction rules apply only to tax years during which the state’s fiscal year ends in a sufficient surplus that must be refunded under the Taxpayer’ Bill of Rights (TABOR), section 20 of article X of the State Constitution. In order to qualify for the subtraction for gains on the sale of individual assets of a pass through entity, both the entity and the partner/Sub S stockholder/member of the pass-through entity must satisfy the applicable holding period for each asset. The Colorado capital gain subtraction is limited to the lesser of the amount of the federal net capital gain reported on Schedule D or the qualifying Colorado net capital gain. www.revenue.state.co.us /fyi/html/income15.html   (2658 words)

 Subtraction Race - Math Lesson Plan, Thematic Unit, Activity, Worksheet, or Teaching Idea Check for understanding: Ask students to show the answers to the subtraction problems given by holding up the corresponding number of fingers. The teacher will read a subtraction problem to the students who, upon hearing the question, must run down to their box, locate the index card with the correct answer on it, and return to the teacher in the quickest amount of time. Read the first subtraction problem to the first set of racers. www.lessonplanspage.com /MathPESubtractionRace1.htm   (448 words)

 Modeling Subtraction: Overview Children were introduced to subtraction in Kindergarten and have experience with separating and comparing groups. Subtraction is the inverse of addition, and although it is a different concept, it may be taught by using similar materials, models, and methods. As for modeling addition, have children use manipulatives, such as counters, connecting cubes, and beans, to model subtraction, as well as pictures to depict subtraction facts and to illustrate subtraction problems. www.eduplace.com /math/mw/background/1/02/te_1_02_overview.html   (382 words)

 The Physics Classroom Be sure to begin by determining the primary color(s) of light which are incident upon the object and then subtracting the absorbed color from the incident color(s). If a filter is capable of absorbing a color of light which is not present in the mixture of incident light, then merely disregard that color; since that color of light is not present, it cannot contribute to the color appearance of the object. The process of color subtraction is a useful means of predicted the ultimate color of an object if the color of the incident light and the pigments are known. www.physicsclassroom.com /Class/light/U12L2e.html   (2908 words)

 Subtraction at AllExperts Subtraction is one of the four basic arithmetic operations; it is essentially the opposite of addition. Subtraction is used to model several closely related processes:#From a given collection, take away (subtract) a given number of objects.#Combine a given measurement with an opposite measurement, such as a movement right followed by a movement left, or a deposit and a withdrawal.#Compare two objects to find their difference. Subtraction is not associative or commutative— in fact, it is anticommutative— but addition of signed numbers is both. en.allexperts.com /e/s/su/subtraction.htm   (590 words)

 Subtraction Subtracting one number from another number is to find the difference between them. As 7 cannot be subtracted from 3, add 10 units to 3 in the top number to form 13 and add 10 units to 90 in the bottom number which adds up to 100 as shown above. As 7 cannot be subtracted from 3, borrow ten from the tens column and add it to 3 and at the same time, reduce the number of tens from 5 to 4 as shown above. www.mathsteacher.com.au /year7/ch01_whole/03_sub/sub.htm   (564 words)

 Math Forum - Ask Dr. Math Archives: Elementary Subtraction This year is awful -- she can't seem to grasp the basics of subtraction. An explanation of using borrowing to calculate 12 5/11 minus 2 6/11 is extended to borrowing when subtracting times, liquid measures, and other wholes and parts in general. My son has a problem understanding addition and subtraction when he has to do regrouping, what I call carrying and borrowing... mathforum.org /library/drmath/sets/elem_subtraction.html   (700 words)

 Addition and Subtraction in Center Time For subtraction, students choose one domino at a time and write the subtraction sentence that matches the dots, making sure they write the larger number first, using numbers and symbols or words. The dots and addition and subtraction sentences are recorded on the Domino Directions Addition or Subtraction Sheet. Addition or subtraction may be the focus of this activity, depending on the students’ needs. www.uen.org /Lessonplan/preview.cgi?LPid=14164   (2898 words)

 Color Subtraction If a filter is capable of absorbing a color of light which is not present in the mixture of incident light, then merely disregard that color; since that color of light is not present, it cannot contribute to the color appearance of the object. Each of the three colors which are primary to an artist (magenta, cyan, and yellow) subtract red, green, and blue individually from an otherwise white sheet of paper. The process of color subtraction is a useful means of predicted the ultimate color of an object if the color of the incident light and the pigments are known. www.glenbrook.k12.il.us /gbssci/phys/Class/light/u12l2e.html   (2821 words)

 #8: K-12 Education Subtraction and Credit The amount of your subtraction or credit is based on the actual qualifying expenses you paid during the year for your child’s K–12 education—for which you have documentation—up to the maximums allowed by law. Keep in mind that the subtraction and credit may be claimed only to the extent of your actual expenses, and you cannot use the same expenses to claim both the subtraction and the credit. For both the subtraction and credit, Rita’s qualifying expenses must be claimed in the year in which the fee is paid, not when the class is taken. www.taxes.state.mn.us /individ/other_supporting_content/inctaxfs8.shtml   (3066 words)

 LESSON PLANS: 1241 Subtraction Lessons reviewed by Teachers Incorporating Addition and Subtraction into Everyday Life - Students solve one addition and one subtraction word problem using tools and examples to help them easier explain the concepts. Goldfish Addition and Subtraction - Students engage in a hands-on addition and subtraction activity which is a wonderful tie-in with ocean studies. See-Saw Subtraction - Students play a BINGO type game and listen to the story, Twenty is Too Many by Kate Duke. www.lessonplanet.com /search/search?media=lesson&keywords=Subtraction   (408 words)

 Arithmetic Software SeriesSUBTRACTION Students learn subtraction from a variety of perspectives - counting, eliminating, graphing followed by practice, practice, practice. Once the basic subtraction concepts are learned, this math software program moves on 2-3-4-and-5-digit subtraction with borrowing - each step of the process is presented and practiced. Subtraction's most difficult concept is learned with detailed introductions and helpful hints in the practice problems. www.mathmedia.com /subtraction.html   (308 words)

 NICMOS Data Handbook Chapter 5.5: PSF Subtraction   (Site not responding. Last check: ) Accurate PSF subtraction is a prime concern for an observer wishing to study faint features around bright objects. One way to get a high quality PSF for subtraction is to measure an isolated bright unsaturated star in the same image or to construct a composite PSF using good stars in the image. PSF subtraction with NICMOS Camera 3 is extremely difficult due to the large pixel scale which severely undersamples the point spread function, and because of the strong intrapixel sensitivity variations (see section 5.3.3) which affect the structure of point source images. www.stsci.edu:8083 /hst/nicmos/documents/handbooks/DataHandbookv5/nic_ch56.html   (884 words)

 Thermo Scientific - Algorithms - Spectral Subtraction One problem with spectral subtraction is that it tends to be very subjective. This is basically an iterative algorithm which calculates the subtraction factor by minimizing the complexity of the residual spectrum. Iterate until the change in the subtraction factor values is less than a preset tolerance or range is too small. www.thermo.com /com/cda/resources/resources_detail/1,2166,13440,00.html   (417 words)

 Flix Productions - Subtraction Game Subtraction can be difficult to master, but with the "Animated Arithmetic" subtraction game it just got much easier! The student will be motivated to complete the subtraction practice as quickly and accurately as possible in order to get to the fun part - the subtraction game room. The subtraction activities are separate from the game activities to avoid confusion and help the student concentrate on the task at hand. www.flixprod.com /subjects/subtraction-game.html   (144 words)

 Education credit and subtraction However, excess expenses for the credit may be used as an education subtraction for that year up to the subtraction limits. The subtraction must be based on the taxpayer’s actual expenses paid during the tax year for which they must have proof, including receipts and cancelled checks. However, the requirement that the school be located in one of these five states does not apply for the qualifying expenses (with the exception of transportation expenses) used for the credit. www.taxes.state.mn.us /individ/credits_subtractions_additions/education_credits_subtractions/educ_credit_sub.shtml   (1040 words)

 subtraction — Infoplease.com Our flashcards cover addition, subtraction, multiplication, and division; from basic math facts to 3-digit problems that will have you reaching for your scratch paper. Identification and remediation of systematic error patterns in subtraction. Learning strategies for addition and subtraction facts: the road to fluency and the license to think. www.infoplease.com /ce6/sci/A0847073.html   (227 words)

 Fact Controlled Subtraction These pages were not designed for initial instruction in subtraction, but as a review for students who had tried and failed with a traditional approach. While I do use these materials now for some initial instruction in subtraction, their best use is still as a reteaching material. While transition to subtracting without fact support is a goal of this program, that level will occur at different points for different students. www.mathdittos2.com /fcs.html   (385 words)

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