Maths!

1: 34+56=

2: 145-64=

3: DO YOU LIKE MATHS

4: 12,300+12,000

5: 10-30

6: 3x6

7: 12x12

8: 8+8

9: 60-45

10: 89+20

11: Which IS FASTEST

12: 12-6=

13: 1245+45

14: 1245+45

15: 1245+45

16: 5+5

17: 10+10

18: 19+1

19: 23+3