1. 1: number bonds within 10 4 5 4 5 + 0 = 5 4 + 1 = 5 3 + 2 = 5
2 + 3 = 5
1 + 4 = 5
0 + 5 = 5 4 5 8 4 7 5

2. Using related facts (If _____, what is ____?)
1: number bonds within 10
Using related facts (If _____, what is ____?)
If = 7, what is…
3 + 4
7 – 3
7 – 4
700 – 400
77 – 43
0.007 – 0.003
5 + 3
14 + 3
4 + 4
4 + 53
4, ,400
5 + 2
87 – 4
777 – 343
7.77 – 4.43

3. Using related facts (If _____, what is ____?)
2: number bonds to 10
1 + 9 = 10
2 + 8 = 10
3 + 7 = 10
4 + 6 = 10
5 + 5 = 10 10 4 10 3
Reordering: which numbers would you add together first in these number sentences? Why?
Make it clear that there isn’t always an easier order to add number in, but we can look.
Use the diagram to complete the number sentences:
___ + ___ = ___
___ – ___ = ___
Using related facts (If _____, what is ____?)
If = 10, what is…
4 + 6
70 – 4
10 – 6
70 – 6
10 – 4
100 – 40
500 – 40
7 + 4
16 + 4
6 + 5
56 + 4
7 + 3
6 + 34
1 – 0.4

4. 3: crossing 10 (+) =
6 + 4 = 10
= 13

5. 3: crossing 10 (+)

6. Using related facts (If _____, what is ____?)
3: crossing 10 (+)
Using related facts (If _____, what is ____?)
If = 14, what is…
8 + 6
14 – 8
14 – 6
140 – 80
240 – 80
7 + 8
16 + 8
6 + 9
56 + 8
7 + 7
6 + 38
1.4 – 0.6

7. Count on to find the difference Count on to find the difference
4: crossing 10 (-)
Count back
Count on to find the difference
Count on to find the difference

8. Using related facts (If _____, what is ____?)
4: crossing 10 (-)
Using related facts (If _____, what is ____?)
If = 8, what is…
15 - 8
14 – 6
25 - 7
7 + 8
13 – 5
35 - 7
8 + 7
12 – 4
75 - 8
2.5 – 0.7
15 - 6
350 – 70
15 – 5 1,
550 – 80
14 - 7
7, ,000
6,500 – 700