Show:
Doubles
Make 10's
Fast 10's
Neighbors
Fast 9's
100

=8

Double 4

100

Which number needs 5 to make 10?

5

100

18

10 + 8

100

Which neighboring numbers make 11?

6 + 5

100

9 and what number makes 12?

9 + 3

200

=12

Double 6

200

Which number needs 3 to make 10?

7

200

16

10 + 6

200

Which neighboring numbers make 9?

What is 4 + 5?

200

9 and what number makes 14?

9 + 5

300

=16

Double 8

300

Which number needs 2 to make 10?

8

300

20

10 + 10

300

Which neighboring numbers make 13

7 + 6

300

9 and what number makes 16?

9 + 7

400

=20

Double 10

400

Which number needs 0 to make 10?

10

400

10

10 + 0

400

Which neighboring numbers make 15?

8 + 7

400

9 and what number makes 11?

9 + 2

500

=30

Double 15

500

Which number needs 5 to make 20?

15

500

11

10 + 1

500

Which neighboring numbers make 17?

9 + 8

500

9 and what number makes 17?

9 + 8