Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 693 · 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. 1.500 increased by 35% =
2. 2.432 decreased by 50% =
3. 3.98 increased by 50% =
4. 4.475 increased by 40% =
5. 5.560 increased by 60% =
6. 6.400 decreased by 15% =
7. 7.785 increased by 20% =
8. 8.540 decreased by 20% =
9. 9.288 decreased by 75% =
10. 10.255 increased by 60% =
11. 11.200 increased by 15% =
12. 12.630 increased by 30% =
13. 13.760 decreased by 35% =
14. 14.500 decreased by 5% =
15. 15.520 increased by 20% =
16. 16.164 increased by 25% =
17. 17.710 increased by 60% =
18. 18.220 increased by 30% =
19. 19.350 increased by 8% =
20. 20.520 increased by 15% =
21. 21.80 increased by 35% =
22. 22.700 increased by 15% =
23. 23.660 decreased by 15% =
24. 24.775 increased by 8% =
25. 25.550 increased by 30% =
26. 26.500 increased by 60% =
27. 27.630 decreased by 60% =
28. 28.700 increased by 15% =
29. 29.520 decreased by 15% =
30. 30.790 increased by 30% =
31. 31.720 decreased by 5% =
32. 32.305 decreased by 40% =
33. 33.730 increased by 40% =
34. 34.228 decreased by 50% =
35. 35.570 increased by 10% =
36. 36.270 increased by 30% =
37. 37.680 increased by 30% =
38. 38.430 increased by 30% =
39. 39.520 increased by 60% =
40. 40.770 increased by 60% =

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