9 posters outlining mental math strategies for subtraction.
Strategies include:
Print these posters and display them in your classroom as a reference for students.
Check out these other mental math posters:
Understand subtraction as an unknown-addend problem. For example, subtract 10 - 8 by finding the number that makes 10 when added to 8.
Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - ...
Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship b...
Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addit...
Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in addin...
Explain why addition and subtraction strategies work, using place value and the properties of operations.
Solve two-step word problems using the four operations. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including roundi...
Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.
Multiply or divide to solve word problems involving multiplicative comparison, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem, distinguishing multiplicative comparison from additive comparison.
Apply basic fact strategies to add and subtract within 20, including making 10 and decomposing a number leading to a 10;
Explain strategies used to solve addition and subtraction problems up to 20 using spoken words, objects, pictorial models, and number sentences; and
Recall basic facts to add and subtract within 20 with automaticity;
Solve with fluency one-step and two-step problems involving addition and subtraction within 1,000 using strategies based on place value, properties of operations, and the relationship between addition and subtraction;
Solve with fluency one- and two-step problems involving multiplication and division, including interpreting remainders.
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Warm-up your students' brains each day with this 68-slide PowerPoint containing a variety of quick activities.
Develop a love of addition facts with this multiplayer Valentine’s Day board game.
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A set of 22 matching cards to explore the number combinations of 10.
Warm-up with this 10-page booklet of multiplication and division drills.
A worksheet to practice the addition strategy of making 10.
A set of match-up cards to practice the addition strategy Making 10.
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A ten frame mat and a double ten frame mat to use in a variety of ways.
A fun, hands-on game students can play to practice the 'Taking from 10' subtraction strategy.
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