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Calculating Percentages in Steps

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You can calculate percentages by first finding what 10% of a value is and then what 5 or 1% is. From there you can multiply to find multiples and then add to get the required percentage. The example below shows this.

What is 35% of $40?

Step 1

What is 10% of $40?

10% of $40 = $40 ÷ 10 = $4

10% is a relatively easy percentage and can be found by dividing by 10.

Step 2

3 x $4 = $12

30% of $40 = $12

30% is 3 times ( 3 x) 10% so we multiply what 10% of $40 is by 3

Step 3

What is 5% of $40?

5% of $40 = $4 ÷ 2 = $2

5% is half of what 10% is so divide what 10% is by 2 .

Step 4

What is 35% of $40?

$12 + $2 = $14

Add what 30% is to what 5% is.

Use the above steps to calculate the percentages fill in the blanks in the tables below. The first table is completed for you.

  10% 30% 5% 35%
$10 $1 $3 $0.50 $3.50
$20 $2 $6 $1 $7
$40 $4 $12 $2 $14
  10% 40% 5% 45%
$10 $1 $4 $0.50 $4.50
$20 $2 $8 $1 $9
$60 $6 $24 $3 $27
  10% 80% 5% 85%
$50 $5 $40 $2.50 $42.50
$90 $9 $72 $4.50 $76.50
$100 $10 $80 $5 $85
  10% 1% 2% 12%
$40 $4 $0.40 $0.80 $4.80
$60 $6 $0.60 $1.20 $7.20
$140 $14 $1.40 $2.80 $16.80

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Use similar steps as shown on the first example to calculate the percentages and complete the tables below.

  10% 1% 6% 16%
$20 $2 $0.20 $1.20 $3.20
$70 $7 $0.70 $4.20 $11.20
$120 $12 $1.20 $7.20 $19.20
  10% 1% 3% 13%
$40 $4 $0.40 $1.20 $5.20
$80 $8 $0.80 $2.40 $10.40
$200 $20 $2 $6 $26
  10% 1% 8% 18%
$30 $3 $0.30 $2.40 $5.40
$70 $7 $0.70 $5.60 $12.60
$100 $10 $1 $8 $18
  10% 5% 2.5% 17.5%
$20 $2 $1 $0.50 $3.50
$30 $3 $1.50 $0.75 $5.25
$40 $4 $2 $1 $7
  10% 5% 2.5% 12.5%
$30 $3 $1.50 $0.75 $3.75
$80 $8 $4 $2 $10
$90 $9 $4.50 $2.25 $11.25
  10% 60% 5% 65%
$40 $4 $24 $2 $26
$70 $7 $42 $3.50 $45.50
$90 $9 $54 $4.50 $58.50

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