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Cogito

Grade 3 Math · Chapter 1 · Lesson 4

Practice Worksheet

Division as an Unknown Factor

Every division is a multiplication with a gap in it.

10 problems · about 13 minutes · 3.OA.B.6, 3.OA.A.4

NameDate

Figure — use these to answer the problems

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

6 + 6 + 6 + 6 = 24

4 × 6 = 24

Rows4
Columns6
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

2 problems

  1. From “Division as Sharing”

    24 ÷ 4 = ?

    Answer

  2. From “Arrays and the Commutative Property”

    You know 9 × 2 = 18. What is 2 × 9?

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. 45 ÷ 5 = ?

    Answer

  2. What question does 24 ÷ 6 really ask?

    • What times 6 makes 24?
    • What do you add to 6 to make 24?

  3. ? × 5 = 20. What is the missing factor?

    Answer

  4. 18 ÷ 2 = ?

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. 40 ÷ 10 = ?

    Answer

  2. ? × 3 = 15. What is the missing factor?

    Answer

Stretch Yourself

Mixed problems. Work out what kind of question it is before you start.

2 problems

  1. The Seating Plan

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

    Answerrows

  2. Checking Work

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

    Answer