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Cogito

Grade 5 Math · Chapter 4 · Lesson 2

Practice Worksheet

Multiplying a Decimal by a Whole Number

Count in tenths, then say what you counted.

10 problems · about 15 minutes · 5.NBT.B.7

NameDate

Figure — use these to answer the problems

Each grid is one whole. Count the shaded hundredths.

25/100 = 0.25

0.00.10.20.30.40.50.60.70.80.91.0
Hundredths25
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

2 problems

  1. From “Multiplying by Powers of Ten”

    0.08 × 100 = ?

    Answer

  2. From “Estimating with Decimals”

    Estimate 7.8 + 2.1 to the nearest whole numbers.

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. 9 × 0.3, in tenths?

    Answer

  2. Why work in tenths instead of decimals?

    • It turns the question into whole numbers.
    • It has more steps.

  3. 3 × 0.7, in tenths?

    Answer

  4. 8 × 0.2, in tenths?

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. 5 × 0.12, in hundredths?

    Answer

  2. 7 × 0.05, in hundredths?

    Answer

Stretch Yourself

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

2 problems

  1. The Ribbons

    5 ribbons of 0.6 metres each. How many tenths in all?

    Answertenths

  2. The Cost

    4 items at 0.25 pounds each. How many hundredths in all?

    Answerhundredths