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Cogito

Grade 4 Math · Chapter 4 · Lesson 1

Practice Worksheet

Factor Pairs

Every rectangle you can build from a number.

10 problems · about 14 minutes · 4.OA.B.4

NameDate

Figure — use these to answer the problems

Build rectangles. Each one that comes to 12 is a factor pair of 12.

3 × 4 = 12

Rows3
In each row4
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

2 problems

  1. From “Multistep Word Problems”

    7 × 24 − 68 = ?

    Answer

  2. From “What the Remainder Means”

    35 children, buses hold 9. How many buses?

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. How many factors does 36 have?

    Answer

  2. Is 1 a factor of every number?

    • Yes.
    • No.

  3. How many factors does 16 have?

    Answer

  4. How many factors does 10 have?

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. Is 7 a factor of 42?

    • Yes. 7 × 6 = 42.
    • No.

  2. What is the largest factor of 30 apart from 30?

    Answer

Stretch Yourself

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

2 problems

  1. The Garden Beds

    24 plants in equal rows. How many different rectangles are possible?

    Answerrectangles

  2. The Chairs

    20 chairs in rows of 6. Does that work with none left over?

    • No. 6 is not a factor of 20.
    • Yes.