Show:
Addition
Subtraction
100

Add.

12+78=

90

100

Subtract.

98-39=

59

200

Add.

63+47=

110

200

Subtract.

23-19=

4

300

Add.

45+34=

79

300

Subtract.

44-29=

15

400

Add.

56+89=

145

400

Subtract.

51-38=

13

500

Add.

24+28=

52

500

Subtract.

72-26=

46