Fractions with the Same Denominator
Primary 4 · Mathematics
Fractions with the Same Denominator
Lesson 1 of 5
25 min
Let's begin
Keza's mother cuts a pineapple into 8 equal slices for the family. Keza eats 3 slices. What part of the pineapple did she eat? We cannot answer with a whole number. We need a fraction.
A fraction describes part of a whole that has been cut into equal parts. Keza ate 3 of the 8 equal slices, so she ate 38 (three eighths) of the pineapple.
In 25, the whole bar is cut into 5 equal parts (the denominator), and 2 parts are shaded (the numerator).
A fraction with 1 on top, like 18, is called a unit fraction. 38 is made of three pieces of size 18.
| Fraction | In words |
|---|---|
| 12 | one half |
| 13 | one third |
| 34 | three quarters |
| 25 | two fifths |
| 58 | five eighths |
| 710 | seven tenths |
A fraction is also a number. Cut the space from 0 to 1 into 4 equal jumps and each jump is 14. Two jumps land on 24 and three jumps land on 34.
Explore: in the Fractions: Intro simulation, choose circles, bars or a number line and build fractions by changing the top and bottom numbers.
Tip
D is for Down. The denominator is down at the bottom and tells how many equal parts make the whole. The numerator on top counts the parts you have.
Work each one in your exercise book first. Then tap Show answer to check.
A bar is cut into 6 equal parts and 5 are shaded. What fraction is shaded?
Answer: 56
Write 310 in words.
Answer: three tenths
Write "four ninths" as a fraction.
Answer: 49
In 712, which number is the denominator?
Answer: 12
There are 8 samosas on a plate and Gatete eats 3 of them. What fraction did he eat? What fraction is left?
Answer: He ate 38. 58 is left.
What you learned today
Sources and credits
The stories, Rwandan worked examples, diagrams and practice questions were written by Ganzaa.
Quick check
A cake is cut into 5 equal pieces. Uwase eats 2 pieces. What fraction did she eat?
