20 Percent is One-Fifth

20% is 1/5
To find 20% of a number divide by 5 (Tip/time-saver: or divide by 10 and double) 40% = 2/5 etc.
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1. 20 % is 1/5 To find 20% of a number divide by 5 ( Tip/time-saver : or divide by 10 and double) 40 % = 2/5 , 60% = 3/5; 80% = 4/5; 100% = 5/5. By Jim Olsen, W.I.U. #P9

2.                       20% 120% 4 0% 6 0% 8 0% 100% 140% 180% 160% 2 00% 0%

3. Find the percent 10 makes out of 50 attempts: 32 yes votes on 40 ballots: 1,200 adults out of 2,000 members:

4. If the number is easily divisible by 5: To find 20% of a number divide by 5 Examples: 20% of 30 is 6 20% of 45 is 9

5. If the number is not easily divisible by 5: Divide by 10 and double Examples: 20% of 31 is 6.2 20% of 230 is 46

6. Recall the strategy: To find A% of B You can change the percent to a fraction, Find B divided by the bottom, then Multiply by the top. Find 60% of 35

7. Examples: If the total revenue is $500 and 40% is profit, how much is profit? If to make 30 tons cement mixture we 60% sand, how much sand do we need? This year’s sales are 120% of last year’s sales. If last year we sold $ 4,500, what are sales this year? If commission is 20% and the sale was $2,340, what is the commission?

8. Closing Notes  Remember  20% is 1/5 To find 20% of a number divide by 5 (or divide by 10 and double) 40% = 2/5, 60% = 3/5; 80% = 4/5 #P9