Grade 3Math
FractionsShow the size of equal parts with fractions
When you split 1 m into parts of the same length, the length of one part is shown with a fraction. A fraction can also be shown as how many of a base fraction it is.
The narration and the pictures are in Japanese. You can hear the same words that are used in class at a Japanese school.
- Video
- 1:07（6 scenes）
- Problems
- 2 problems
Let's try
Write the math sentence in your notebook first, then open the answer.
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1Which fraction with denominator 4 shows the length of 2 of the 1/4 m parts?
Hint
The denominator shows how many parts the whole was split into, and the numerator shows how many of those parts there are.
Answer
It is 2/4 m. It is 2 of the 4 equal parts, so the denominator is 4 and the numerator is 2.
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2What is the bottom number of a fraction called?
Hint
It starts with "de."
Answer
The denominator. It shows how many parts the whole was split into.
Words in this lesson
- denominator 分母
- The bottom number of a fraction. It shows how many parts the whole was split into.
- numerator 分子
- The top number of a fraction. It shows how many of those parts there are.
- unit fraction 単位分数
- A fraction whose numerator is 1 (such as 1/4).
For parents and guardians
- The names of lessons and the order of topics differ slightly between textbooks. This page follows the content of Japan's national curriculum guidelines (the Course of Study).
- Folding a real paper tape to split it into equal lengths helps your child get a feel for the idea that "one of 4 equal parts" is 1/4.
- In 3rd grade, it is important to think of a fraction as "how many unit fractions" it is. That 1/2 and 2/4 are the same size is learned in a later grade.