Math

1. WELCOME TO THE
WORLD OF NUMBERS
Raymundo, Joyce E.
Mathematics 6 Teacher
ADDITION AND
SUBTRACTION OF
FRACTIONS

2. OBJECTIV
ES
recall the Least Common
Denominator of the given set
of numbers.
apply and use the 3 methods
(to be presented by the
teacher) in finding the LCD.
add and subtract similar and
dissimilar fractions
with/without regrouping.
solve routine and non-routine
problems involving addition
and subtraction of fractions
using appropriate problem –
solving strategies.

3. What is a proper
fraction?
Let’s Review

4. What is an improper
fraction?
Let’s Review

5. What is a mixed
fraction?
Let’s Review

6. What are similar
fractions?
Let’s Review

7. What are dissimilar
fractions?
Let’s Review

8. Determine whether
proper, improper, or
mixed fraction
4
5
11
8
17
8
4
3
5
3
10
23
52

9. Determine whether
proper, improper, or
mixed fraction
7
12
50
18
7
28
75
19
8
6
7
14
2
9

10. Where can we
associate fractions in
our lives?

11. Can you cite a situation
where fractions play an
important role?

12. STEPS IN SOLVING
DISSIMILAR
FRACTIONS
3. Add/Subtract the
numerator, then copy
the denominator
4. Simplify
1. Find the least
common denominator
(LCD)
2. Change the
fractions into similar
fractions

13. Example
#1
3/8 + 1/7 = ?
Step 1. 8 = 8, 16, 24, 32, 40, 48, 56
7 = 7, 14, 21, 28, 35, 42, 49, 56
LCM = 56
Step 2. 3/8 = 21/56
1/7 = 8/56

14. Example
#1
Step 3. 21/56 + 8/56 = 29/56
Step 4. Since 29/56 is already on its
simplest term, that is the final answer.

15. 9/10 - 6/20 = ?
Try this!

16. 5/12 - 2/6 = ?
Try this!

17. 𝟑
𝟒
𝟓
+ 𝟔
𝟐
𝟑
= ?
Example #2

18. 𝟖
𝟒
𝟗
+ 𝟔
𝟑
𝟒
= ?
Try this!

19. 𝟖 − 𝟒
𝟏
𝟑
= ?
Example #3

20. 𝟑𝟓 − 𝟕
𝟒
𝟗
= ?
Try this!

21. 𝟏𝟐
𝟏
𝟑
− 𝟕
𝟒
𝟓
= ?
Example #4

22. 𝟏𝟏
𝟐
𝟓
− 𝟐
𝟔
𝟏𝟎
= ?
Try this!

23. Example
#5
Kuya Kim wants to buy a
pasalubong for his friends. On a
nearby shop, he bought 4/9 kg of
corn and 3/7 kg of sugarcane.
How heavy is Kuya Kim’s
pasalubong in total?

24. Example
#5
4/9 + 3/7 = ?
Step 1. 9 = 9, 18, 27, 36, 45, 54, 63
7 = 7, 14, 21, 28, 35, 42, 49, 56, 63
LCM = 63
Step 2. 4/9 = 28/63
3/7 = 27/63

25. Example
#5
Step 3. 28/63 + 27/63 = 55/63
Step 4. 55/63

26. Kuya Kim wants to buy a
pasalubong for his friends. On a
nearby shop, he bought 6/7 lbs of
sugpo. One of his companions
on the trip saw it and asked for
the 1/3 of it. If Kuya Kim gave it,
how much was left to him?
Try this!

27. A family has 9 ½ boxes of
cassava cakes. During the
weekend, their guests ate 2 5/6
boxes of the cake. How many
boxes were left?
Try this!

28. What are the
steps in solving
similar fractions?

29. STEPS IN
SOLVING
SIMILAR
FRACTIONS
Add/Subtract the
numerator, then copy the
denominator.
Simplify.
Similar Fractions

30. 11/18 + 9/18 = ?
Try this!

31. 9/15 - 5/15 = ?
Try this!

32. What are your
takeaways?

33. CRÉDITOS: Esta plantilla es una creación de Slidesgo, e incluye iconos de
Flaticon, e infografías e imágenes de Freepik
Thank you
for listening!