Show:
Before
After
Making 10
adding
subtracting
100
What comes before 69?
68
100
45
46
100
what goes with 1 to make 10?
9
100
13+5
18
100
15-5
5
200
50?
49
200
20
21
200
what goes with 2 to make 10?
8
200
I have 12 treats and my friend gives me 4. How many do I have?
16
200
10-7
3
300
39
38
300
29
40
300
what goes with 6 to make 10?
4
300
6+6
12
300
18-17
1
400
89
88
400
69
70
400
what goes with 7 to make 10?
3
400
7+7
14
400
20-3
17
500
90
89
500
99
100
500
what goes with 10 to make 10?
0
500
8+8
16
500
18-8
10