Mental Math Subtraction Posters

Common Core State Standards alignment

• CCSS.MATH.CONTENT.1.OA.B.4
  In Grade 1Standards for Mathematical PracticeOperations & Algebraic ThinkingUnderstand and apply properties of operations and the relationship between addition and subtraction

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

• CCSS.MATH.CONTENT.1.OA.C.5
  In Grade 1Standards for Mathematical PracticeOperations & Algebraic ThinkingAdd and subtract within 20

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

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

  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 - ...

• CCSS.MATH.CONTENT.1.NBT.C.4
  In Grade 1Standards for Mathematical PracticeNumber & Operations in Base TenUse place value understanding and properties of operations to add and subtract

  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...

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

  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...

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

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

• CCSS.MATH.CONTENT.2.NBT.B.5
  In Grade 2Standards for Mathematical PracticeNumber & Operations in Base TenUse place value understanding and properties of operations to add and subtract

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

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

  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...

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

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

• CCSS.MATH.CONTENT.3.OA.D.8
  In Grade 3Standards for Mathematical PracticeOperations & Algebraic ThinkingSolve problems involving the four operations, and identify and explain patterns in arithmetic

  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...

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

  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....

• CCSS.MATH.CONTENT.4.OA.A.2
  In Grade 4Standards for Mathematical PracticeOperations & Algebraic ThinkingUse the four operations with whole numbers to solve problems

  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....