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TOPIC 11

Compose and Decompose Numbers 11 to 19

OVERVIEW

Topic 11 builds a foundation for place value by focusing on composing and decomposing teen numbers as ten ones and some more ones.

COMPOSE AND DECOMPOSE NUMBERS 11 TO 19

Make the Numbers 11 to 19 Your child will compose all of the teen numbers by putting together 10 ones and some more ones. Your child will show how to make the numbers using objects, drawings, and equations.

A double 10 frame with 10 tickets in the first frame and 7 tickets in the second frame.

Find Parts of the Numbers 11 to 19 Your child will decompose all of the teen numbers by breaking apart each number into 10 ones and the remaining ones. Your child will use objects, drawings, and equations to show how to break apart the numbers. A group of 10 red and 6 yellow counters. The number 16 is written below.

A double 10 frame with 10 red counters in the first frame and 6 yellow counters in the second frame.

CONNECT THE MATH

You can connect the math in this topic to everyday experiences. Draw attention to teen numbers you and your child see in your home or when you are out. Have your child tell you the parts of the teen number. For example, a shirt might have a $13 price tag. The number 13 can be decomposed into 10 and 3.

Topic 11 Lessons