Mental Math Subtraction Posters

  Common Core Curriculum alignment

• CCSS.MATH.CONTENT.1.OA.B.4

  Understand subtraction as an unknown-addend problem. For example, subtract 10 - 8 by finding the number that makes 10 when added to 8.

  In Grade 1Standards for Mathematical PracticeOperations & Algebraic ThinkingUnderstand and apply properties of operations and the relationship between addition and subtraction
• CCSS.MATH.CONTENT.1.OA.C.5

  Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

  In Grade 1Standards for Mathematical PracticeOperations & Algebraic ThinkingAdd and subtract within 20
• CCSS.MATH.CONTENT.1.OA.C.6

  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 - ...

  In Grade 1Standards for Mathematical PracticeOperations & Algebraic ThinkingAdd and subtract within 20
• CCSS.MATH.CONTENT.1.NBT.C.4

  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...

  In Grade 1Standards for Mathematical PracticeNumber & Operations in Base TenUse place value understanding and properties of operations to add and subtract
• CCSS.MATH.CONTENT.1.NBT.C.6

  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...

  In Grade 1Standards for Mathematical PracticeNumber & Operations in Base TenUse place value understanding and properties of operations to add and subtract
• CCSS.MATH.CONTENT.2.OA.B.2

  Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.

  In Grade 2Standards for Mathematical PracticeOperations & Algebraic ThinkingAdd and subtract within 20
• CCSS.MATH.CONTENT.2.NBT.B.5

  Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

  In Grade 2Standards for Mathematical PracticeNumber & Operations in Base TenUse place value understanding and properties of operations to add and subtract
• CCSS.MATH.CONTENT.2.NBT.B.7

  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...

  In Grade 2Standards for Mathematical PracticeNumber & Operations in Base TenUse place value understanding and properties of operations to add and subtract
• CCSS.MATH.CONTENT.2.NBT.B.9

  Explain why addition and subtraction strategies work, using place value and the properties of operations.

  In Grade 2Standards for Mathematical PracticeNumber & Operations in Base TenUse place value understanding and properties of operations to add and subtract
• CCSS.MATH.CONTENT.3.OA.D.8

  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...

  In Grade 3Standards for Mathematical PracticeOperations & Algebraic ThinkingSolve problems involving the four operations, and identify and explain patterns in arithmetic
• CCSS.MATH.CONTENT.3.NBT.A.2

  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.

  In Grade 3Standards for Mathematical PracticeNumber & Operations in Base TenUse place value understanding and properties of operations to perform multi-digit arithmetic
• CCSS.MATH.CONTENT.4.OA.A.2

  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.

  In Grade 4Standards for Mathematical PracticeOperations & Algebraic ThinkingUse the four operations with whole numbers to solve problems