Unit 1, Lesson 15# Use place value understanding to fluently decompose to smaller units multiple times in any place using the standard subtraction algorithm, and apply the algorithm to solve word problems using tape diagrams

EngageNY 60 min(s)

In this lesson, students subtract multi-digit numbers with multiple decompositions, including decomposing numbers with multiple zeros (1,000 and 1,000,000), and use addition to check their answers. When decomposing multiple zeros, they use place value chips to model the decomposition and relate their representations to the standard algorithm to better support conceptual understanding of the algorithm. They use tape diagrams to represent the part-whole relationship and the unknown, and then apply the use of tape diagrams to model a subtraction word problem with five decompositions.