1st grade level math

Subtracting With 10's

100

10 - 9 =

1

200

10 - 3 =

7

300

10 - 5 =

5

400

10 - 10 =

0

500

10 - 6 = 

4

Subtracting With 20's

100

20 - 10 =

10

200

20 - 5 =

15

300

20 - 7 =

13

400

20 - 15 = 

5

500

20 - 16 =

4

Adding With 10's

100

10 + 5 =

15

200

10 + 3 =

13

300

10 + 10 = 

20

400

10 + 13 =

23

500

10 + 21 =

31

Adding With 20's

100

20 + 1 =

21

200

20 + 5 =

25

300

20 + 10 =

30

400

20 + 15 =

35

500

20 + 20 =

40