Grade 3Math
Units of WeightGrams and kilograms
We weigh things with a scale and show the weight in grams (g) or kilograms (kg). Let's choose the unit that fits what we weigh.
The narration and the pictures are in Japanese. You can hear the same words that are used in class at a Japanese school.
- Video
- 1:11（6 scenes）
- Problems
- 2 problems
Open this lesson in Japanese（重さの単位）
Let's try
Write the math sentence in your notebook first, then open the answer.
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1Which of these weights is easy to understand if you show it in kg: "the weight of an eraser," "your own body weight," or "the weight of an egg"?
Hint
Which one is heavy?
Answer
"your own body weight." A person's body weight is heavy, so we show it in kg. Erasers and eggs are shown in g.
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2If you put 700 g of apples into a 300 g basket, how many g is it in all? How many kg is it?
Hint
1 kg is 1000 g.
Answer
It is 1000 g. It is the same weight as 1 kg.
Words in this lesson
- gram (g) グラム（g）
- A unit of weight. One 1-yen coin weighs about 1 g.
- kilogram (kg) キログラム（kg）
- A unit of weight. 1 kg is the same weight as 1000 g.
- scale はかり
- A tool for weighing things.
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).
- One 1-yen coin weighs about 1 g. Using a kitchen scale at home to "guess first, then weigh" things around you helps your child develop a sense of weight.
- Tons (t) are not covered on this page.