Shapes
4+5=
9
8-3=
5
How many ones are in the number 18?
7+5=
12
10-5=
5
How many tens are in the number 54?
5 tens
9+4=
13
10-10=
0
How many tens and how many ones are the number 39?
3 tens and 9 ones
15+4=
19
13-2=
11
What does the number 4 mean in the number 46?
40
22+8=
30
20-5=
15
What does the number 7 mean in the number 72?
70