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Math · Grade 3 Math

Chapter 1: Multiplication and Division as Equal Groups

Division as an Unknown Factor

Every division is a multiplication with a gap in it.

Lesson
4
Time
About 13 minutes
0 of 8 done

Step 1: Let's Learn

Read it, or press Listen and follow the words.

56 ÷ 8 asks a question you can answer with multiplication: what times 8 makes 56?

You have done this before

In Grade 1, subtraction was finding a missing part. Division is finding a missing factor.

No second table

If you know your times tables, you already know your division facts. They are the same facts.

Check by multiplying

If 24 ÷ 6 = 4, then 4 × 6 should give 24 back.

Division is a multiplication with a gap

12 ÷ 3 asks: three times what makes 12? Written as a multiplication it is 3 × ? = 12. Any division can be rewritten this way, which means you never need a separate set of division facts — you need the times tables and the habit of reading them backwards.

Why this rewriting helps so much

Most children find recall of 3 × 4 = 12 easier than recall of 12 ÷ 3 = 4, simply because they practised it more. Turning every division into a missing-factor question lets you use the stronger memory. This is not a trick for beginners — it is how the two operations actually relate.

You cannot divide by zero

12 ÷ 0 would ask: zero times what makes 12? Nothing works, because zero times anything is zero. There is no answer, so the question is not allowed. Understanding it as a missing-factor question is what makes this rule sensible rather than arbitrary.

Step 2: Try It Yourself

One relationship, read four ways.

The array shows the multiplication and the division at the same time.

6 + 6 + 6 + 6 = 24

4 × 6 = 24

4 rows of 6 makes 24.

Step 3: Watch an Example

One step at a time.

Watch Leo Turn a Division Round

Leo is asked for 35 ÷ 5.

  1. Step 1

    He rewrites it as a question about multiplication: what times 5 makes 35?

Step 4: Your Turn

Practice makes it stick.

The Seating Plan

Problem 1 of 2

30 chairs are put into rows of 5. How many rows are there?

rows

Checking Work

Problem 2 of 2

Ana says 28 ÷ 4 = 7. Check it: what is 7 × 4?

Find the Missing Factor

1 of 4

? × 5 = 20. What is the missing factor?

2 of 4

18 ÷ 2 = ?

3 of 4

40 ÷ 10 = ?

4 of 4

? × 3 = 15. What is the missing factor?

Step 5: Quick Check

Show what you know.

Question 1 of 2

45 ÷ 5 = ?

Question 2 of 2

What question does 24 ÷ 6 really ask?

What You Learned

  • A division asks for a missing factor.
  • 56 ÷ 8 means: what times 8 makes 56?
  • Your times tables are your division facts too.