9 posters outlining mental math strategies for addition.
Strategies include:
Print these posters and display them in your classroom as a reference for students.
Check out these other mental math posters:
Apply properties of operations as strategies to add and subtract.2 Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 ...
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...
Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
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 up to four two-digit numbers using strategies based on place value and properties of operations.
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...
Mentally add 10 or 100 to a given number 100-900, and mentally subtract 10 or 100 from a given number 100-900.
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.
Fluently add and subtract multi-digit whole numbers using the standard algorithm.
Compose 10 with two or more addends with and without concrete objects;
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
Use relationships to determine the number that is 10 more and 10 less than a given number up to 120;
Recall basic facts to add and subtract within 20 with automaticity;
Add up to four two-digit numbers and subtract two-digit numbers using mental strategies and algorithms based on knowledge of place value and properties of operations;
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;
Add and subtract whole numbers and decimals to the hundredths place using the standard algorithm;
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Find the hidden gems and place their numbers into the correct positions on the worksheet to solve each addition problem.
Solve addition facts, interpret coordinate planes, and draw shapes to reveal a mystery picture.
Incorporate this mental math drills booklet into your math lesson warm-up routine.
Use a range of addition and subtraction strategies to solve twenty word problems that contain numbers 1–50.
Use a range of addition and subtraction strategies to solve twenty single-digit word problems.
Start the school day with this 81-slide PowerPoint presentation containing a variety of Reading and Math warm-up activities.
Warm-up your students' brains each day with this 68-slide PowerPoint containing a variety of quick activities.
A set of 40 matching cards to explore the number combinations of 20.
Develop a love of addition facts with this multiplayer Valentine’s Day board game.
A set of 22 matching cards to explore the number combinations of 10.
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