Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 623 · 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. 1.400 increased by 30% =
2. 2.185 decreased by 20% =
3. 3.40 decreased by 30% =
4. 4.275 decreased by 12% =
5. 5.300 decreased by 75% =
6. 6.420 increased by 10% =
7. 7.756 decreased by 25% =
8. 8.590 increased by 10% =
9. 9.580 decreased by 15% =
10. 10.300 increased by 20% =
11. 11.65 increased by 40% =
12. 12.95 decreased by 20% =
13. 13.200 increased by 40% =
14. 14.680 decreased by 40% =
15. 15.390 increased by 40% =
16. 16.580 increased by 5% =
17. 17.180 decreased by 5% =
18. 18.504 decreased by 25% =
19. 19.500 decreased by 5% =
20. 20.160 increased by 30% =
21. 21.488 increased by 50% =
22. 22.400 decreased by 5% =
23. 23.675 decreased by 12% =
24. 24.100 increased by 25% =
25. 25.500 decreased by 8% =
26. 26.480 increased by 35% =
27. 27.204 decreased by 25% =
28. 28.580 increased by 35% =
29. 29.220 increased by 40% =
30. 30.220 increased by 75% =
31. 31.740 decreased by 20% =
32. 32.625 decreased by 40% =
33. 33.64 increased by 25% =
34. 34.720 increased by 5% =
35. 35.772 increased by 75% =
36. 36.280 increased by 15% =
37. 37.460 decreased by 30% =
38. 38.145 decreased by 20% =
39. 39.700 increased by 30% =
40. 40.470 increased by 20% =

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