Show:
Addition
Subtraction
Addition 2
Subtraction 3
Mystery???
100

12 + 10 =

22

100
12 - 10 =
What is 2?
100

416 + 52 =

468

100
16 - 16 =
What is 0?
100
13 + 8 =
What is 21?
200

25 + 14 =

39

200
25 - 14 =
What is 11?
200

421 + 18 =

 439

200
21 - 19 =
What is 2?
200
27 - 8 =
What is 19?
300

38 + 11 =

49

300
38 - 11 =
What is 27?
300

733 + 25 =

758

300
33 - 28 =
What is 5?
300
35 + 22 =
What is 57?
400

41 + 20 =

61

400
41 - 20?
What is 21?
400

547 + 12

559

400
42 - 13 =
What is 29?
400
42 - 19 =
What is 23?
500

59 + 10 =

69

500
59 - 10 =
What is 49?
500

102+17

119

500
64 - 46 =
What is 18?
500
98 - 39 =
What is 59?