One number as a percentage of another

The Maths Habit

Ash and Bo each eat the shaded part of a chocolate bar. Who ate more of their own bar?

AshBoAsh: he ate most of his bar. Bo ate less than half of hers.

The whole is 100. What percentage is shaded?

1002323%
1007070%
10088%

Percent (%)
Out of 100.
%
The whole
All of it. The whole is 100%.
whole
The part
Some of the whole.
part

wholepart
132×?partwhole=?100=?%×?
  1. 1Put the part over the whole.The part on top. The whole on the bottom.
  2. 2Make the whole 100.Multiply the whole to get 100. Multiply the part by the same number.
  3. 3Add a % sign.Out of 100 is per cent.

Write 6 as a percentage of 20.

206= 30%
132×5620=30100=30%×5
1Put the part over the whole.
2Make the whole 100.
3Add a % sign.

Write 7 as a percentage of 10.

107= 70%
132×10710=70100=70%×10
1Put the part over the whole.
2Make the whole 100.
3Add a % sign.

Write 6 as a percentage of 20.

206= 30%
132×5620=30100=30%×5
1Put the part over the whole.
2Make the whole 100.
3Add a % sign.
1Put the part over the whole.2Make the whole 100.3Add a % sign.

Write 2 as a percentage of 20.

202= 10%
132×5220=10100=10%×5

Write 6 as a percentage of 20.

206= 30%
132×5620=30100=30%×5
1Put the part over the whole.
2Make the whole 100.
3Add a % sign.
1Put the part over the whole.2Make the whole 100.3Add a % sign.

Write 9 as a percentage of 10.

109= 90%
132×10910=90100=90%×10

Write 6 as a percentage of 20.

206= 30%
132×5620=30100=30%×5
1Put the part over the whole.
2Make the whole 100.
3Add a % sign.
1Put the part over the whole.2Make the whole 100.3Add a % sign.

A box has 20 eggs. 5 are brown. What percentage are brown?

205= 25%
132×5520=25100=25%×5

1Put the part over the whole.2Make the whole 100.3Add a % sign.

1Write 4 as a percentage of 10.

104
×10410=40100=40%×10

2Write 1 as a percentage of 20.

201
×5120=5100=5%×5

3Write 10 as a percentage of 20.

2010
×51020=50100=50%×5

4Write 8 as a percentage of 10.

108
×10810=80100=80%×10

How many of each make 100?

251004
501002
201005

Write 3 as a percentage of 25.

253= 12%
132×4325=12100=12%×4
1Put the part over the whole.
2Make the whole 100.
3Add a % sign.

Write 8 as a percentage of 50.

508= 16%
132×2850=16100=16%×2
1Put the part over the whole.
2Make the whole 100.
3Add a % sign.

Write 3 as a percentage of 25.

253= 12%
132×4325=12100=12%×4
1Put the part over the whole.
2Make the whole 100.
3Add a % sign.
1Put the part over the whole.2Make the whole 100.3Add a % sign.

Write 5 as a percentage of 25.

255= 20%
132×4525=20100=20%×4

Write 3 as a percentage of 25.

253= 12%
132×4325=12100=12%×4
1Put the part over the whole.
2Make the whole 100.
3Add a % sign.
1Put the part over the whole.2Make the whole 100.3Add a % sign.

Write 4 as a percentage of 50.

504= 8%
132×2450=8100=8%×2

Write 3 as a percentage of 25.

253= 12%
132×4325=12100=12%×4
1Put the part over the whole.
2Make the whole 100.
3Add a % sign.
1Put the part over the whole.2Make the whole 100.3Add a % sign.

8 of 25 students have a dog. What percentage is this?

258= 32%
132×4825=32100=32%×4

One number as a percentage of another worksheet, page 1

One number as a percentage of another worksheet, page 2

Answer sheet

Is it right?
Thumbs up: right. Thumbs down: wrong.

  1. 3 out of 10 is 30%

    Right

  2. 7 out of 20 is 7%

    Wrong: make the whole 100. It is 35%

  3. 4 out of 25 is 16%

    Right

  4. 6 out of 20 is 60%

    Wrong: multiply by 5, not 10. It is 30%

  5. 9 out of 50 is 18%

    Right

  1. Write 3 out of 5 as a percentage. Hint: 5 × 20 = 100.

    60%

  2. Write 12 as a percentage of 40. Use a calculator: 12 ÷ 40 × 100.

    30%

  3. Ali scores 34 out of 40 in maths and 42 out of 50 in science. Which is the better result?

    Maths: 85% beats 84%

  1. Write 3 as a percentage of 20.

    15%
    1Put the partover thewhole.2Make thewhole 100.3Add a % sign.320100==%××

  2. Write 9 as a percentage of 25.

    36%
    1Put the partover thewhole.2Make thewhole 100.3Add a % sign.100==%××

  3. Write 7 out of 50 as a percentage.

    14%
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