1. Adding and Subtracting Fractions

2. Warm up What is the lowest common multiple of: 2 6 = 3 and 4 12 15 5
Find a the missing numbers
What is the lowest common multiple of: 2 6 =
3 and 4 12 15 5
5 and 6 30 3 15 = 8
4 and 6 12 40
3 and 8 24 25 5 = 6
5 and 10 10 30

3. Adding and Subtracting Fractions
Two rulers add three rulers is:
5 rulers
9 pens
Four pens add five pens is:
Two pens add Five rulers is:
7 Pieces of equipment
We can’t so this until we have a name that describes both groups
When we add fractions we need them to have the same name

4. Adding and Subtracting Fractions= 5 7 2 7 + 3 7 = 6 9 2 9 + 4 9 = 4 11 1 11 + 3 11

5. Adding and Subtracting Fractions= 5 7 2 7 + 3 7 = 6 9 2 9 + 4 9 = 2 11 5 11 - 3 11

6. Adding and Subtracting Fractions
We need to make sure the denominator of both fractions is the same before we add or subtract
We need a number in the 5 and 10 times table to use as our bottom number- 10? = 2 5 + 3 10 4 10 + 3 10 = 7 10

7. Adding and Subtracting Fractions
We need to make sure the denominator of both fractions is the same before we add or subtract
We need a number in the 3 and 12 times table to use as our bottom number- 12? = 1 3 + 5 12 4 12 + 5 12 = 9 12

8. Adding and Subtracting Fractions
We need to make sure the denominator of both fractions is the same before we add or subtract
We need a number in the 5 and 6 times table to use as our bottom number- 30? = 2 5 + 3 6 12 15 30 + 30 27 30 =

9. Adding and Subtracting Fractions
We need to make sure the denominator of both fractions is the same before we add or subtract
We need a number in the 8 and 3 times table to use as our bottom number- 24? = 7 8 - 2 3 21 16 24 - 24 = 5 24

10. Adding and Subtracting Fractions
7/8
8/12
7/9
7/10
2/3
11/12
8/15
16/12 or 1 ¼
11/24
1 7/12
1 5/56
29/30
29/52
1 1/10
5/8
5/12
1/3
2/5
1/2
7/20
8/21
23/36
9/22
71/126
Adding and Subtracting Fractions
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