WALT: knowing the basic addition strategies and facts
What we need to remember
Addition is when we are bringing two (or more) new numbers together to get a larger sum.
When we know our bonds of ten, and can then extend it to twenty, it helps our understanding of adding larger tens numbers.
Knowing how many makes ten can help us to reach the next ten, and then we can add the remainder.
Bonds of ten
1 + _ = 10
2 + _ = 10
3 + _ = 10
4 + _ = 10
5 + _ = 10
6 + _ = 10
7 + _ = 10
8 + _ = 10
9 + _ = 10
9
Knowing what numbers make ten can help us add bigger numbers.
Bonds of twenty
1 + _ = 20
2 + _ = 20
3 + _ = 20
4 + _ = 20
5 + _ = 20
6 + _ = 20
7 + _ = 20
8 + _ = 20
9 + _ = 20
10 + _ = 20
11 + _ = 20
12 + _ = 20
13 + _ = 20
14 + _ = 20
15 + _ = 20
16 + _ = 20
17 + _ = 20
18 + _ = 20
19 + _ = 20
19
Making ten, then adding the remainder
We know what numbers make ten (bonds of ten), now we need to add beyond that.
Question | Make ten and add the remainder |
4 + 8 = | 4 + 6 = 10, so I would add the reminder of the eight (2) 10 + 2 = 12 |
7 + 9 = | |
5 + 6 = | |
3 + 9 = | |
6 + 7 = | |
8 + 5 = | |
Facts of one-digit numbers to twenty
3 + 8 =
3 + 9 =
4 + 8 =
4 + 9 =
6 + 9 =
4 + 7 =
5 + 6 =
5 + 8 =
7 + 5 =
9 + 5 =
6 + 6 =
7 + 6 =
6 + 8 =
7 + 9 =
7 + 7 =
8 + 8 =
8 + 9 =
9 + 9 =
2 + 9 =
5 + 5 =
5 + 7 =