Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 968 · 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. 1.660 increased by 15% =
2. 2.300 decreased by 15% =
3. 3.105 increased by 60% =
4. 4.420 increased by 30% =
5. 5.220 increased by 40% =
6. 6.572 decreased by 25% =
7. 7.350 increased by 40% =
8. 8.540 increased by 15% =
9. 9.740 increased by 5% =
10. 10.160 decreased by 35% =
11. 11.178 decreased by 50% =
12. 12.175 increased by 12% =
13. 13.690 increased by 60% =
14. 14.645 increased by 60% =
15. 15.648 decreased by 75% =
16. 16.270 decreased by 50% =
17. 17.710 increased by 60% =
18. 18.375 increased by 60% =
19. 19.468 increased by 25% =
20. 20.650 increased by 8% =
21. 21.120 decreased by 20% =
22. 22.150 increased by 30% =
23. 23.140 decreased by 30% =
24. 24.720 decreased by 15% =
25. 25.800 decreased by 8% =
26. 26.160 decreased by 30% =
27. 27.220 decreased by 5% =
28. 28.592 decreased by 75% =
29. 29.540 decreased by 10% =
30. 30.150 decreased by 20% =
31. 31.40 increased by 5% =
32. 32.485 decreased by 40% =
33. 33.300 increased by 20% =
34. 34.375 increased by 8% =
35. 35.80 increased by 5% =
36. 36.156 increased by 50% =
37. 37.60 decreased by 35% =
38. 38.240 decreased by 15% =
39. 39.450 increased by 8% =
40. 40.530 increased by 20% =

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