Unit 4, Lesson 2# Add and subtract multiples of 10 including counting on to subtract

EngageNY 60 min(s)

In this lesson, students apply place-value understanding to add and subtract multiples of 10 before counting on by tens. For example, when adding 20 to 43, they may count 53, 63. Students also develop flexibility in using related addition problems. For example, to solve 92 - 60, one student might think 9 tens - 6 tens is 3 tens, plus 2 is 32, while another starts at 60, adds on 3 tens and then 2 ones to reach 92, so 32.