🔺 Day 8: Composing and Decomposing Numbers

Day 8: Composing and Decomposing Numbers

Introduction

Composing or putting together is the same as combining.  When we compose a group of ten, we are talking about different ways to make a total of ten.  Ten can be made by putting together 1 and 9, 2 and 8, 3 and 7, 4 and 6, and 5 and 5, as well as the opposites of those amounts.  There is a pattern in the numbers that you may notice.  The first number increased and the second number decreased.  Now let's look at the opposite combinations that make ten and listen for the number pattern.  9 and 1, 8 and 2, 7 and 3, 6 and 4, 5 and 5.  In this number pattern, the first number decreased and the second number increased.

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Video

 

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Assignment

In your math journal: Make two drawings that make ten when put together.  Make as many groups as you can.

 

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