addition
9+1
10
10-6
4
85
- 7
78
show 23 in base ten block
2 ten and 3 ones
6+6
12
+ 22
41
15-8
7
- 6
50
show 65 in base ten block
6 tens and 5 ones
7-3
89+
+55
144
24-20
4
- 3
34
show 77 in base 10 block
7 tens and 7 ones
12+4
7+5
12
8-3
5
61
- 15
46
show 42 in base ten blo9ck
4 tens and 2 ones
18-9
9
9+6
15
15-3
12
- 77
12
show 11 in base ten block
1 ten and 1 one
17+3
20