Subtraction and Make 10
10 - 9 =
10 - 9 = 1
8 + 2 = ____
_ + _ = ____
8 + 2 = 10
2 + 8 = 10
7 + n = 12
_ - _ = __
7 + _ = 12
7 + n = 12
12 - 7 = 5
7 + 5 = 12
Create equations for the following fact families:
3 - 7 - 10
3 + 7 = 10
7 + 3 = 10
10 - 7 = 3
10 - 3 = 7
Kate had 9 books. Her mom bought her 3 more. How many books does Kate have now?
9 + 3 = 12
Kate has 12 books now.
6 - 0 =
6 - 0 = 6
7 + 4 = ____
_ + _ = ____
7 + 4 = 11
4 + 7 = 11
6 + n = 13
_ - _ = __
6 + _ = 13
6 + n = 13
13 - 6 = 7
6 + 7 = 13
Create equations for the following fact families:
8 - 9 - 17
8 + 9 = 17
9 + 8 = 17
17 - 8 = 9
17 - 9 = 8
Peter scored 15 goals in soccer games this year. He scored 7 goals during home games. How many goals did Peter score during away games?
15 - 7 = 8
Peter scored 8 goals during away games.
3 + 7 + 6 =
[3] + [7] + 6 =
[10] + 6 = 16
6 + 5 = ____
_ + _ = ____
6 + 5 = 11
5 + 6 = 11
2 + n = 9
_ - _ = __
2 + _ = 9
2 + n = 9
9 - 2 = 7
2 + 7 = 9
Create equations for the following fact families:
4 - 8 - 12
4 + 8 = 12
8 + 4 = 12
12 - 8 = 4
12 - 4 = 8
Allan had 9 pieces of candy. He gave 5 pieces away. How many pieces does Allan have left?
9 - 5 = 4
Allan has 9 pieces of candy left.
6 - 3 =
6 - 3 = 3
Use parentheses to group the addends. Solve.
4 + 4 + 5 = ____
(4 + 4) + 5 = 13
OR
4 + (4 + 5) =13
4 + n = 17
_ - _ = __
4 + _ = 17
4 + n = 17
17 - 4 = 13
4 + 13 = 17
What is a fact family? Use words.
A fact family is a group of numbers that equal each other when using addition or subtraction.
Name two strategies you can use to add numbers.
- Counting on
- Make 10
- Doubles/ Nearly doubles
9 + 2 + 5 + 1 = ___
[9] + 2 + 5 + [1] =
[10] + 2 + 5 = 17
Use parentheses to group the addends. Solve.
7 + 4 + 1 = ___
(7 + 4) + 1 = 12
OR
7 + (4 + 1) = 12
7 + n = 18
_ - _ = __
7 + _ = 18
7 + n = 18
18 - 7 = 11
7 + 11 = 18
Create equations for the following fact families:
9 - 5 - 14
9 + 5 = 14
5 + 9 = 14
14 - 9 = 5
14 - 5 = 9
Name two strategies you can use to subtract.
- Counting back
- Subtract all
- Doubles/Nearly doubles