By: Clairy Faith C. Sinohon

BEED-SPED 3x4

I. OBJECTIVES

At the end of a 45-minute period, the grade four pupils will be able to:

1. Add and subtract fractions with the same denominators,

2. Add and subtract fractions with dissimilar denominators.

II. SUBJECT MATTER

ADDING AND SUBTRACTING OF FRACTIONS

A. References

Elementary Mathematics 4, page 53-56.

B. Materials

Power point presentation, visual aids

III. PROCEDURE

A. Learning Strategies

Prayer

Checking of attendance

Review of the past lesson

B. Motivation : “One little two”

C. Lesson proper

To add fractions with similar

denominators, we simply add the

numerators andwrite the sum over

the same denominator.

Dulce ate ⅖ of the cake in the morning

and ⅕ in the afternoon. How much cake

was eaten by her?

What is asked in the problem? The amount of cake

eaten by Dulce.

What are given? 2/5 cake in the morning and 1/5 in the afternoon.

To subtract fractions with similar

denominators, we simply subtract

the numerators and write the difference

over the same denominator.

A water tank was ⅞ full of water. After a

day of use, it was ⅜ full. How much water

was used during the day?

What is asked? The amount of water that

was used during the day.

What are given?7/8 full of water and 3/8 full

after a day of use.

To find the amount of water that was

used during the day, we are going to

subtract 3/8 from 7/8. So simply subtract

the numerators 7-3 is equal to 4 and write

it over the same denominator which is 8

and then we get 5/8.

To add fractions with dissimilar

denominators, rename the

dissimilar fractions into similar

fractions by finding the (LCD) and then

proceed as in adding fractions with the

same denominator.

Mother used ⅗ liter of cooking oil last month

and ⅔ liter this month. How much did she

use in two months?

What is asked? The amount of cooking oil

mother used in two months.

What are given? 3/5 liter of cooking oil last

month and 2/3 liter this month.

To subtract fractions with dissimilar

denominators, rename the dissimilar

fractions into similar fractions by finding

the (LCD) and then proceed as in

subtracting fractions with the same

denominator.

Aling Dionisia, a stuffed-toy maker, uses 5/9

bag of stuff for a dog and 4/6 bag of stuff for

a cat. How much more stuff does she use

for a dog than for a cat.

What is asked? The amount of stuff she

use for a dog than for a cat.

What are given?4/6 bag of stuff for dog and

5/9 bag of stuff for a cat.

.

IV. EVALUATION

Direction: Solve each problem.

1. Julie bought ½ meter of red ramie cloth for her table napkins and 3/6 white ramie...