Solving multiplication and division problems
Solve problems involving multiplication and division using arrays, repeated addition, mental methods, and known facts
What a learner can do afterwards
- Solve 'There are 5 bags with 2 apples in each. How many apples?' using repeated addition or known fact
- Solve 'Share 15 sweets equally among 3 children' using grouping
- Draw an array to solve a multiplication problem in context
1 · Read
When you have groups that are all the same size, you do not need to count everything one by one. Instead, you can add the same number again and again, once for each group. This is called repeated addition.
Leo has 5 bags of stars. Each bag has 4 stars. He adds 4 five times: 4 + 4 + 4 + 4 + 4 = 20. Leo has 20 stars in total.
If you already know a multiplication fact, like 2 times 5 equals 10, use it instead of adding every time. Repeated addition helps you understand multiplication, and known facts help you go fast.
Repeated addition means adding the same number once for every group, and a known fact can get you there even faster.
More to read
Key ideas: solve one-step word problems involving multiplication and division
Some stories have equal groups. 5 bags with 2 apples in each. 3 plates with 5 cakes on each. To solve, add the groups. 2 + 2 + 2 + 2 + 2 is 10. That add-up is called times. 5 bags of 2 is 5 times 2. Draw dots to see it. Make 3 rows with 4 dots in each row. Count all the dots. There are 12. The rows show 3 times 4. Groups, rows, and dots all tell the same tale.
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2 · Watch
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14 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.