Mutiplying Fractions for Grade 5

1. MATHEMATICS 5
Multiplying Fractions
WEEK 6

2. Visualize multiplication of fractions
using models
Multiply a fraction and a whole number
and another fraction
Multiply mentally proper fractions with
denominators up to 10
(MELC-Math 5)

3. Reducing or Simplifying Fractions
4
10
=
2
5
÷ 2
÷ 2
REVIEW
GCF

4. Changing Mixed Number to Improper Fraction
2
3
5
=
REVIEW
13
5
5 x 2 + 3

5. Changing Improper Fraction to Mixed Number
17
5
=
REVIEW
𝟑
2
5
3
5 17
-15
2

6. Multiplying Fractions

7. Multiplying Fractions
𝟏
𝟐
𝟏
𝟒
of
𝟏
𝟖
= 𝟏
𝟐
𝟏
𝟒
x =
1.Multiply the
numerators.
2.Multiply the
denominators.
3.Reduce the
answer to lowest
term, if possible.

8. =
1
4
2
10
x
2
40
1
4
𝑜𝑓
2
10
Multiplying Fractions
= =
𝟏
𝟐𝟎
Cancellation Method
1. Look for a pair of numerator
and denominator to cancel or
reduce.
2. Multiply.
1
4
2
10
x =
1
2
𝟏
𝟐𝟎

9. =
2
3
24
1
x
48
3
2
3
𝑜𝑓 24
Multiplying Fraction by Whole Number
= =16
Cancellation Method
1. Look for a pair of numerator
and denominator to cancel or
reduce.
2. Multiply.
2
3
24
1
x =
8
1
16
1
=16

10. =
1
8
5
1
x
10
80
1
8
𝑥 5 𝑥
2
10
Multiplying Fraction and a Whole Number and Another Fraction
= =
𝟏
𝟖
Cancellation Method
1. Look for a pair of numerator
and denominator to cancel or
reduce.
2. Multiply.
=
1
4
𝟏
𝟖
x
2
10
1
8
5
1
x x
2
10
1
2

11. =
2
3
19
6
x
38
18
2
3
𝑥 3
1
6
Multiplying Fraction by Mixed Number
= =2
2
18
Cancellation Method
1. Look for a pair of numerator
and denominator to cancel or
reduce.
2. Multiply.
2
3
19
6
x =
1
3
19
9
= 2
𝟏
𝟗
= 𝟐
𝟏
𝟗

12. MATHtry
Nga!

13. •
2
4
4
16
3
9
5
15
8
12

14. =
1
4
2
3
x
2
12
1
4
𝑜𝑓
2
3
What is
𝟏
𝟒
of
𝟐
𝟑
?
= =
𝟏
𝟔
Cancellation Method
1. Look for a pair of numerator
and denominator to cancel or
reduce.
2. Multiply.
1
4
2
3
x =
1
2
𝟏
𝟔

15. =
7
8
2
3
x
14
24
7
8
𝑜𝑓
2
3
What is
𝟕
𝟖
multiplied by
𝟐
𝟑
?
= =
𝟕
𝟏𝟐
Cancellation Method
1. Look for a pair of numerator
and denominator to cancel or
reduce.
2. Multiply.
7
8
2
3
x =
1
4
𝟕
𝟏𝟐

16. =
4
9
18
1
x
72
9
4
9
𝑜𝑓 18
𝐖𝐡𝐚𝐭 𝐢𝐬
𝟒
𝟗
𝐨𝐟 𝟏𝟖?
= =8
Cancellation Method
1. Look for a pair of numerator
and denominator to cancel or
reduce.
2. Multiply.
4
9
18
1
x =
2
1
8
1
=8

17. =
1
4
6
1
x
12
20
1
4
𝑥 6 𝑥
2
5
What is the product
1
4
𝑥 6 𝑥
2
5
?
= =
𝟑
𝟓
Cancellation Method
1. Look for a pair of numerator
and denominator to cancel or
reduce.
2. Multiply.
=
3
2
𝟑
𝟓
x
2
5
1
4
6
1
x x
2
5
1
1

18. =
2
5
10
1
x
20
40
2
5
𝑥 10 𝑥
1
8
What is the product
2
5
𝑥 10 𝑥
1
8
?
= =
𝟏
𝟐
Cancellation Method
1. Look for a pair of numerator
and denominator to cancel or
reduce.
2. Multiply.
=
2
1
𝟏
𝟐
x
1
8
2
5
10
1
x x
1
8
1
4
1
2

19. Asynchronous Activity
Do the exercises in the module
(What I Can Do and Assessment on pages 10-13).
(Work for the Math folio)
THINKING LOG
Week: 6
Things I learned today:
Things I like most in the lessons:
Questions I want to ask:
My most enjoyable experience in the lessons: