Lesson: Subtraction Strategies within 20: Breaking Apart

In this lesson, we will learn how to subtract one-digit numbers from teen numbers by first subtracting the ones to make ten and then subtracting the remaining amount.

Sample Question Videos

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Worksheet: 17 Questions • 3 Videos

Q1:

We can make 10 to help us subtract.

Fill in all the missing numbers.

Q2:

Adam started with 16.

He took away 6 to make 10, then took away 2 more.

Pick a calculation that is the same as what Adam did.

Q3:

Look at how Daniel made 10 to help him subtract.

Use his method to find the answer.

Help him finish this new calculation.

What should he do next to find ?

Find the answer.

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