+0/+1
6 + 0 =
6 + 1 =
6
7
1 + 1 =
2
5
4 + ? = 10
6
What is the turn around fact for 3 + 5 = 8?
5 + 3 = 8
12 + 0 =
12 + 1 =
12
13
8 + 8 =
16
6 + 7 =
13
7 + ? = 10
3
What is the turn around fact for 15 + 5 = 20?
5 + 15 = 20
45 + 0 =
45 + 1 =
45
46
10 + ? = 20
10
What doubles fact would help you solve:
4 + 5 = ?
4 + 4 = 8
18 + ? = 20
2
Name the two turn around facts for the fact family:
3, 2, 5
3 + 2 = 5
2 + 3 = 5
209 + 0 =
209 + 1 =
209
210
? + 9 = 18
9
What is the doubles +1 fact for the doubles fact of
7 +7 = 14
7 + 8 = 15
? + 15 = 20
5
Name the two turn around facts for the fact family:
5, 6, 11
5 + 6 = 11
6 + 5 = 11
4,329 + 0 =
4,329 + 1 =
4,329
4,330
What do all sums of doubles facts have in common?
They're all even (count by 2's)
What do all sums of doubles +1 facts have in common?
They're all odd.
20 + ? = 20
0
Name the two turn around facts for the fact family:
10, 25, 15
10 + 15 = 25
15 + 10 = 25