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Cogito

Grade 3 Math · Chapter 3 · Lesson 6

Practice Worksheet

Multiplying by Multiples of Ten

Multiply the digits, then count the tens.

10 problems · about 13 minutes · 3.NBT.A.3

NameDate

Figure — use these to answer the problems

This array counts tens, not ones. 4 rows of 3 tens.

4 × 3 = 12

How many groups4
How many tens in each3
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

2 problems

  1. From “The Associative Property”

    2 × 5 × 6 = ?

    Answer

  2. From “Multiplying by 8 and 9”

    7 × 9 = ?

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. 7 × 40 = ?

    Answer

  2. Why does 4 × 30 end in a zero?

    • Because you counted tens, not ones.
    • Because you always add a zero.

  3. 3 × 40 = ?

    Answer

  4. 8 × 50 = ?

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. 9 × 80 = ?

    Answer

  2. 6 × 60 = ?

    Answer

Stretch Yourself

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

2 problems

  1. The Boxes

    5 boxes each hold 20 pencils. How many pencils?

    Answerpencils

  2. The Seats

    7 rows of 30 seats. How many seats?

    Answerseats