Grade 3Math
Division with 2-Digit AnswersThink with bundles of 10, and split by place
We think about divisions whose answers have 2 digits, like 60 ÷ 3 and 69 ÷ 3. If you think with bundles of 10, or split the number into the bundles of 10 and the loose ones, you can calculate with the times tables.
The narration and the pictures are in Japanese. You can hear the same words that are used in class at a Japanese school.
- Video
- 1:05（6 scenes）
- Problems
- 3 problems
Open this lesson in Japanese（答えが 2けたに なる わり算）
Let's try
Write the math sentence in your notebook first, then open the answer.
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1Calculate 86 ÷ 2 by splitting it by place.
Hint
Split 86 into the bundles of 10 and the loose ones, and divide each part by 2.
Answer
It is 43. Split 86 into 80 and 6, and calculate 80 ÷ 2 = 40, 6 ÷ 2 = 3, 40 + 3 = 43. Check: 43 × 2 = 86
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2Calculate 90 ÷ 3.
Hint
Think about how many bundles of 10 make 90.
Answer
It is 30. 90 is 9 bundles of 10. 9 ÷ 3 = 3, so it is 3 bundles of 10, which is 30.
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3Calculate 48 ÷ 4, and check with multiplication.
Hint
Split 48 into 40 and 8.
Answer
It is 12. 40 ÷ 4 = 10, 8 ÷ 4 = 2, 10 + 2 = 12. Check: 12 × 4 = 48
Words in this lesson
- bundle of 10 10の たば
- 10 things put together as one group. 60 is 6 bundles of 10.
- splitting by place 位ごとに 分ける
- Thinking of a number as the bundles of 10 and the loose ones. 69 is 60 and 9.
- checking たしかめ
- Multiplying the answer of a division by the divisor to see if you get back the number you started with.
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).
- This page covers only the simple cases where both the tens place and the ones place divide evenly. Please check together, using marbles or 10-yen and 1-yen coins, that 60 ÷ 3 can be thought of with the same times table fact as 6 ÷ 3 if you see it as "6 bundles of 10," and that 69 ÷ 3 becomes a combination of calculations your child already knows if you split it into 60 and 9.
- Calculations like 72 ÷ 3, where the tens place does not divide evenly, and the column method for division are learned in 4th grade. Building the habit of checking that "answer × divisor" gives back the original number will also help with the column method in 4th grade.