Show:
10
doubles
more doubles
+2
+3
100
5+5
100
2+2
What is 4
100
5+5
What is 10
100
2+2
What is 4
100
1+3
What is 4
200
9+1
200
3+3
What is 6
200
10+10
What is 20
200
3+2
What is 5
200
3+4
What is 7
300
8+2
300
4+4
What is 8
300
8+8
What is 16
300
6+2
What is 8
300
5+3
What is 8
400
7+3
400
6+6
What is 12
400
9+9
What is 18
400
7+2
What is 9
400
6+3
What is 9
500
6+4
500
7+7
What is 14
500
100+100
What is 200
500
4+2
What is 6
500
9+3
What is 12