Grade 3Math
DecimalsNumbers that show a leftover amount of liquid
When you measure with a 1 L measuring box, there may be a leftover amount less than 1 L. If you use one of the 10 equal parts of 1 L, you can show the leftover amount with a number.
The narration and the pictures are in Japanese. You can hear the same words that are used in class at a Japanese school.
- Video
- 1:22（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 is the biggest number: 0.9, 1.2, or 0.3?
Hint
Compare starting from the number to the left of the decimal point (the whole number part).
Answer
1.2. It is the only one bigger than 1.
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2What number is 7 groups of 0.1 put together?
Hint
Think about how many 0.1s it is.
Answer
It is 0.7.
Words in this lesson
- decimal 小数
- A number written with a decimal point, like 0.1 or 1.3.
- decimal point 小数点
- The "." mark in 1.3. It separates the whole number part and the 1/10 place.
- whole number 整数
- Numbers like 0, 1, 2, 3, and so on.
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).
- In 3rd grade, children meet decimals as numbers that show a leftover amount, such as one of 10 equal parts of 1 L (0.1 L). Counting "how many 0.1s" together using the marks on a measuring cup or a milk carton helps your child get a feel for the size of decimals.
- The 1/100 place (0.01) is learned in 4th grade.