Add single digit
56 + 6 =
62
15 - 6=
9
15 + 20 =
35
ten more than 50
60
What does addition mean?
Put numbers together to get a sum
48 + 5 =
53
28 - 9 =
19
44 + 30 =
74
ten less than 40
30
What is a sum?
Answer to an addition problem
17 + 9 =
26
33 - 6 =
27
88 - 20 =
68
ten more than 15
25
What does it mean to decompose?
Break a number into parts
89 + 4 =
93
91 - 5 =
86
25 + 40 =
65
ten more than 38
48
What are odd numbers?
Cannot be broken in half evenly
1, 3, 5, 7, 9
26 + 8 =
34
60 - 5 =
55
71 - 30 =
41
ten less than 57
47
What are even numbers?
Can be split in half evenly
0, 2, 4, 6, 8