# 14. Multi-digit addition and subtraction word problems (A)

teaches Common Core State Standards CCSS.Math.Content.4.NBT.B.4 http://corestandards.org/Math/Content/4/NBT/B/4
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Lesson objective: Determine whether addition or subtraction is required to solve a word problem. Then apply the standard algorithms.

This lesson provides an opportunity for students to apply their knowledge and understanding of the standard algorithms for addition and subtraction to a mathematical situation. Students are asked to determine missing values in a population chart based on clues and apply the standard algorithms for addition and subtraction to solve.

Key Concept students will use:

• The meanings of addition and subtraction do not change depending on how we perform them.

Skills students will use:

• Students will apply place value concepts in whole number addition and subtraction.

​Students engage in Mathematical Practice 8 (Look for and express regularity in repeated reasoning) as they determine whether to use addition or subtraction and apply the standard algorithms to solve.

Key vocabulary:

• algorithm
• expression
• regrouping

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