Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 210 · 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. 1.635 increased by 60% =
2. 2.280 decreased by 15% =
3. 3.320 decreased by 5% =
4. 4.688 increased by 75% =
5. 5.48 decreased by 25% =
6. 6.390 decreased by 40% =
7. 7.325 decreased by 60% =
8. 8.500 decreased by 40% =
9. 9.350 decreased by 10% =
10. 10.440 decreased by 5% =
11. 11.240 increased by 75% =
12. 12.335 increased by 20% =
13. 13.216 decreased by 50% =
14. 14.385 increased by 20% =
15. 15.140 increased by 35% =
16. 16.420 decreased by 15% =
17. 17.540 increased by 5% =
18. 18.725 increased by 8% =
19. 19.240 decreased by 40% =
20. 20.710 increased by 20% =
21. 21.100 increased by 5% =
22. 22.335 increased by 20% =
23. 23.100 decreased by 15% =
24. 24.676 decreased by 25% =
25. 25.560 decreased by 5% =
26. 26.450 increased by 12% =
27. 27.480 decreased by 15% =
28. 28.95 increased by 20% =
29. 29.620 increased by 35% =
30. 30.560 increased by 5% =
31. 31.400 increased by 8% =
32. 32.240 increased by 15% =
33. 33.445 increased by 40% =
34. 34.310 increased by 20% =
35. 35.534 decreased by 50% =
36. 36.140 decreased by 15% =
37. 37.160 increased by 10% =
38. 38.400 decreased by 12% =
39. 39.70 increased by 60% =
40. 40.68 decreased by 25% =

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