50%, 25% and 10% of an amount

The Maths Habit

  1. What fraction of the bar is shaded?

    25

  2. What fraction is the arrow pointing to?

    0134

  3. What fraction of the bar is one part?

    110

Three phones. Which one would you charge first? Why?

100%
50%
25%

The last one: only a quarter is left. The phone shows it as 25%.

Percent
Out of 100.
Whole amount
All of it. The whole amount is 100%.
Half
One of 2 equal parts.
Quarter
One of 4 equal parts.
Tenth
One of 10 equal parts.

Percent means out of 100. The whole bar is 100%.

100 out of 100 is 100%100%
A half is 50%50%50%
A quarter is 25%25%25%25%25%
A tenth is 10%10%10%10%10%10%10%10%10%10%10%

100%401010101025%25%25%25%
  1. Split the bar.50% is 2 blocks. 25% is 4 blocks. 10% is 10 blocks.
  2. Share the amount.Each block gets the same.
  3. Count the blocks.Add up the blocks you need.

How many blocks make 100%?

Each block is 25% 4 blocks

How many blocks make 100%?

Each block is 10% 10 blocks

Find 25% of 40. Split the bar. Share the amount. Count the blocks. 10

100%401010101025%25%25%25%

Find 10% of 50. Split the bar. Share the amount. Count the blocks. 5

100%5010%10%10%10%10%10%10%10%10%10%5555555555

Find 25% of 40. Split the bar. Share the amount. Count the blocks. 10

100%401010101025%25%25%25%

Find 50% of 60. Split the bar. Share the amount. Count the blocks. 30

100%60303050%50%

Find 25% of 40. Split the bar. Share the amount. Count the blocks. 10

100%401010101025%25%25%25%

Find 10% of 30. Split the bar. Share the amount. Count the blocks. 3

100%3010%10%10%10%10%10%10%10%10%10%3333333333

Find 25% of 40. Split the bar. Share the amount. Count the blocks. 10

100%401010101025%25%25%25%

Find 25% of 16. Split the bar. Share the amount. Count the blocks. 4

100%16444425%25%25%25%

Find 25% of 40. Split the bar. Share the amount. Count the blocks. 10

100%401010101025%25%25%25%

The whole bar is 20. What percentage is shaded? What is it worth? 10%, worth 2

100%20222222222210%10%10%10%10%10%10%10%10%10%

50%, 25% and 10% of an amount worksheet, page 1

How many 10% blocks make 30%?

10%10%10%10%10%10%10%10%10%10% 3 blocks

How many 25% blocks make 75%?

25%25%25%25% 3 blocks

Find 30% of 40. Split the bar. Share the amount. Count the blocks. 12

100%4010%10%10%10%10%10%10%10%10%10%4444444444

Find 75% of 20. Split the bar. Share the amount. Count the blocks. 15

100%20525%25%25%25%555

Find 30% of 40. Split the bar. Share the amount. Count the blocks. 12

100%4010%10%10%10%10%10%10%10%10%10%4444444444

Find 20% of 90. Split the bar. Share the amount. Count the blocks. 18

100%909999999999

50%, 25% and 10% of an amount worksheet, page 2

Answer sheet

Thumbs up: it is right. Thumbs down: it is wrong.

  1. 50% of 30 is 15

    Right

  2. 25% of 40 is 25

    Wrong: it is 10

  3. 10% of 90 is 9

    Right

  4. 20% of 50 is 10

    Right

  5. 75% of 8 is 4

    Wrong: it is 6

  1. 25% of a number is 9. What is the number?

    36

  2. Find 5% of 60.

    3 (half of 10%)

  3. Which is more, 75% of 40 or 50% of 70?

    50% of 70 (35 is more than 30)

  1. Find 25% of 24.

    6
    24

  2. Find 10% of 80.

    8
    80

  3. Find 30% of 60. Split the bar. Share the amount. Count the blocks.

    18
    60
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