Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 465 · 40 questions

The fast method (One-step multiplier): Increase by p%: multiply by (100 + p)% — up 20% is × 1.2. Decrease by p%: multiply by (100 − p)% — down 25% is × 0.75. Easy way to multiply: × the whole number (115 or 75), then ÷ 100.

1. 1.490 increased by 50% =
2. 2.276 decreased by 50% =
3. 3.572 increased by 75% =
4. 4.120 increased by 30% =
5. 5.340 decreased by 10% =
6. 6.50 decreased by 50% =
7. 7.420 increased by 10% =
8. 8.245 increased by 60% =
9. 9.720 increased by 30% =
10. 10.50 decreased by 12% =
11. 11.660 decreased by 30% =
12. 12.600 decreased by 10% =
13. 13.50 decreased by 10% =
14. 14.180 decreased by 10% =
15. 15.336 decreased by 75% =
16. 16.725 increased by 12% =
17. 17.88 increased by 25% =
18. 18.100 increased by 8% =
19. 19.400 decreased by 12% =
20. 20.70 decreased by 10% =
21. 21.720 decreased by 60% =
22. 22.355 decreased by 60% =
23. 23.422 decreased by 50% =
24. 24.384 decreased by 25% =
25. 25.340 increased by 30% =
26. 26.460 increased by 5% =
27. 27.100 decreased by 8% =
28. 28.230 decreased by 10% =
29. 29.120 decreased by 10% =
30. 30.110 decreased by 30% =
31. 31.135 decreased by 20% =
32. 32.395 increased by 20% =
33. 33.450 increased by 8% =
34. 34.528 decreased by 75% =
35. 35.395 increased by 20% =
36. 36.576 decreased by 50% =
37. 37.640 decreased by 60% =
38. 38.230 increased by 30% =
39. 39.96 increased by 25% =
40. 40.440 decreased by 35% =

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