single digit
1+1=
2+2=
What is 4
20+10=
What is 30
15+5=
What is 20
30+20=
What is 50
5+5=
What is 10
3+3=
What is 6
15+15=
What is 30
20+20=
What is 40
15+14
What is 29
3+5=
What is 8
4+4=
What is 8
17+12=
What is 29
36+12
What is 48
22+17
What is 39
7+4
What is 11
5+5=
What is 10
26+13=
What is 39
33+14
What is 47
35+14=
8+7=
What is 15
8+8=
What is 16
34+24=
What is 58
52+27
What is 79
15+73
88