Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 119 · 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. 1.676 increased by 50% =
2. 2.390 decreased by 10% =
3. 3.350 increased by 8% =
4. 4.198 increased by 50% =
5. 5.80 increased by 5% =
6. 6.75 decreased by 60% =
7. 7.260 decreased by 60% =
8. 8.736 decreased by 25% =
9. 9.320 decreased by 5% =
10. 10.125 decreased by 8% =
11. 11.670 decreased by 20% =
12. 12.308 decreased by 75% =
13. 13.450 decreased by 10% =
14. 14.270 increased by 20% =
15. 15.140 decreased by 10% =
16. 16.625 decreased by 60% =
17. 17.200 decreased by 15% =
18. 18.600 increased by 10% =
19. 19.230 increased by 10% =
20. 20.375 increased by 8% =
21. 21.740 decreased by 5% =
22. 22.550 decreased by 30% =
23. 23.600 increased by 12% =
24. 24.40 decreased by 10% =
25. 25.60 decreased by 40% =
26. 26.692 decreased by 75% =
27. 27.300 increased by 20% =
28. 28.154 increased by 50% =
29. 29.720 increased by 15% =
30. 30.215 increased by 40% =
31. 31.715 increased by 20% =
32. 32.500 increased by 35% =
33. 33.160 increased by 15% =
34. 34.685 increased by 40% =
35. 35.60 increased by 75% =
36. 36.540 increased by 15% =
37. 37.450 decreased by 12% =
38. 38.710 decreased by 60% =
39. 39.160 increased by 5% =
40. 40.620 decreased by 15% =

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