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Cogito

Grade 3 Math · Chapter 3 · Lesson 4

Practice Worksheet

Multiplying by 8 and 9

Doubling again, and a pattern worth spotting.

10 problems · about 14 minutes · 3.OA.C.7, 3.OA.B.5

NameDate

Figure — use these to answer the problems

Set the columns to 9 and cut after 5 to see the parts.

7 × 9 = 63

7 × 9 = (7 × 5) + (7 × 4) = 35 + 28 = 63

Rows7
Columns9
Cut after this column5
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

2 problems

  1. From “Multiplying by 7”

    8 × 7 = ?

    Answer

  2. From “Multiplying by 6”

    9 × 6 = ?

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. 7 × 9 = ?

    Answer

  2. In the nine times table, what do the digits of each answer add to?

    Answer

  3. 4 × 8 = ?

    Answer

  4. 8 × 8 = ?

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. 6 × 9 = ?

    Answer

  2. 72 ÷ 8 = ?

    Answer

Stretch Yourself

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

2 problems

  1. The Spiders

    6 spiders each have 8 legs. How many legs?

    Answerlegs

  2. The Rows

    9 rows of 9 chairs. How many chairs?

    Answerchairs