Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 510 · 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. 1.720 decreased by 30% =
2. 2.460 decreased by 60% =
3. 3.660 decreased by 5% =
4. 4.270 increased by 30% =
5. 5.340 decreased by 20% =
6. 6.150 decreased by 8% =
7. 7.152 increased by 50% =
8. 8.795 increased by 20% =
9. 9.690 increased by 60% =
10. 10.700 decreased by 8% =
11. 11.720 decreased by 30% =
12. 12.60 increased by 5% =
13. 13.645 increased by 20% =
14. 14.165 increased by 60% =
15. 15.356 decreased by 25% =
16. 16.592 increased by 25% =
17. 17.180 increased by 15% =
18. 18.480 increased by 5% =
19. 19.600 decreased by 10% =
20. 20.68 increased by 25% =
21. 21.760 increased by 35% =
22. 22.330 decreased by 10% =
23. 23.800 increased by 8% =
24. 24.400 decreased by 10% =
25. 25.450 decreased by 12% =
26. 26.400 increased by 12% =
27. 27.144 decreased by 75% =
28. 28.740 increased by 75% =
29. 29.90 decreased by 10% =
30. 30.60 decreased by 40% =
31. 31.260 increased by 20% =
32. 32.700 decreased by 10% =
33. 33.312 decreased by 25% =
34. 34.474 decreased by 50% =
35. 35.555 decreased by 20% =
36. 36.520 increased by 40% =
37. 37.530 decreased by 40% =
38. 38.620 increased by 30% =
39. 39.520 decreased by 10% =
40. 40.100 decreased by 35% =

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