Adding 10
10 + 2
12
12 - 10
2
Jason had 10 apples. He picked 2 more apples. How many apples did he have altogether?
12 apples
2 + 2
4
9 + ? = 10
8 + 10
18
18 - 10
8
Ally had 6 books. She read 5 more books. How many books did she read altogether?
11 books
4 + 4
8
5 + ? = 10
5
20 + 10
30
20 - 10
10
Zofia collected 10 butterflies. 2 butterflies flew away. How many butterflies does she have now?
8 butterflies
8 + 8
16
6 + ? = 10
4
Is 4 + 10 the same as 10 + 4? Why?
Yes, because they are the same numbers just switched around.
50 - 10
40
Wyatt had 20 slices of pizza. He ate 10 slices of pizza. How many slices does he have now?
10 slices
10 + 10
20
1 + ? = 10
9
What property is this called?
8 + 10 = 10 + 8
Commutative property
100 - 10
90
Abdul had 19 cookies. He ate 10 of those cookies. How many cookies does he have now?
9
50 + 50
100
0