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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 


 Page Break
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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Related Resources
The various resources listed below are aligned to the same standard, (7RP03) taken from the CCSM (Common Core Standards For Mathematics) as the Percentages Worksheet shown above.
Use proportional relationships to solve multistep ratio and percent problems. Examples: ...
Lessons
Page
Worksheets
Similar to the above listing, the resources below are aligned to related standards in the Common Core For Mathematics that together support the following learning outcome:
Analyze proportional relationships and use them to solve realworld and mathematical problems