Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 209 · 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. 1.780 increased by 15% =
2. 2.270 decreased by 50% =
3. 3.575 increased by 12% =
4. 4.140 increased by 5% =
5. 5.760 increased by 20% =
6. 6.740 decreased by 20% =
7. 7.716 increased by 25% =
8. 8.290 decreased by 30% =
9. 9.72 increased by 50% =
10. 10.75 increased by 12% =
11. 11.350 decreased by 8% =
12. 12.120 decreased by 15% =
13. 13.260 increased by 5% =
14. 14.200 decreased by 5% =
15. 15.280 increased by 35% =
16. 16.60 decreased by 25% =
17. 17.560 increased by 15% =
18. 18.520 increased by 35% =
19. 19.390 decreased by 10% =
20. 20.510 increased by 20% =
21. 21.306 decreased by 50% =
22. 22.532 increased by 25% =
23. 23.500 decreased by 15% =
24. 24.548 increased by 75% =
25. 25.80 decreased by 10% =
26. 26.760 increased by 40% =
27. 27.510 increased by 60% =
28. 28.48 increased by 50% =
29. 29.600 decreased by 35% =
30. 30.80 increased by 50% =
31. 31.732 decreased by 50% =
32. 32.200 decreased by 20% =
33. 33.480 increased by 15% =
34. 34.570 decreased by 50% =
35. 35.705 increased by 20% =
36. 36.115 decreased by 20% =
37. 37.112 increased by 75% =
38. 38.660 increased by 10% =
39. 39.635 decreased by 60% =
40. 40.220 decreased by 15% =

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