Strategies for Composing Tens and Hundreds
Description
In Lesson 17 of Topic D, students extend the base ten understanding developed in Topic A to numbers within 200.
In Lesson 18, students use place value disks on a place value chart to represent addition with the composition of 1 ten and 1 hundred.
In Lesson 19, students relate manipulatives to the vertical form, recording compositions as new groups below.
In Lessons 20 and 21, students move from concrete to pictorial as they use math drawings to represent compositions of 1 ten and 1 hundred.
Lesson 22 focuses on adding up to four two-digit addends with totals within 200. Students now have multiple strategies for composing and decomposing numbers, and they use properties of operations (i.e., the associative property) to add numbers in an order that is easiest to compute.
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