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