IXL | Count on and use ten to subtract - up to 20 | 1st grade math

or

Find

11

–

5

.

You can count on and use 10. Which number line shows how?

2

3

4

5

6

7

8

9

10

11

12

2

3

4

5

6

7

8

9

10

11

12

Now, use your choice to subtract.

11

–

5

=

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or

Learn with an example

question

Find

11

–

7

.

You can count on and use 10. Which number line shows how?

2

3

4

5

6

7

8

9

10

11

12

2

3

4

5

6

7

8

9

10

11

12

Now, use your choice to subtract.

11

–

7

=

solution

To find

11

–

7

,

you can count on and use 10.

Start at 7. Count on 3 to get to 10.

2

3

4

5

6

7

8

9

10

11

12

Count on 1 more to get to 11.

2

3

4

5

6

7

8

9

10

11

12

You counted on 4 in all.

11

–

7

=

4

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or

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Work it out

Not feeling ready yet? These can help:

P.12Make ten to add

S.9Subtract by counting on - up to 20