Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 996 · 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. 1.650 increased by 12% =
2. 2.740 decreased by 35% =
3. 3.385 increased by 20% =
4. 4.290 decreased by 30% =
5. 5.500 increased by 5% =
6. 6.475 increased by 40% =
7. 7.640 decreased by 30% =
8. 8.90 decreased by 20% =
9. 9.640 decreased by 15% =
10. 10.172 increased by 75% =
11. 11.700 decreased by 35% =
12. 12.280 decreased by 10% =
13. 13.160 increased by 35% =
14. 14.560 increased by 15% =
15. 15.740 increased by 35% =
16. 16.500 increased by 8% =
17. 17.624 increased by 75% =
18. 18.480 decreased by 75% =
19. 19.330 increased by 40% =
20. 20.155 increased by 20% =
21. 21.304 increased by 25% =
22. 22.320 increased by 35% =
23. 23.220 increased by 5% =
24. 24.275 decreased by 12% =
25. 25.740 decreased by 30% =
26. 26.620 increased by 5% =
27. 27.185 decreased by 40% =
28. 28.160 decreased by 35% =
29. 29.800 decreased by 40% =
30. 30.420 increased by 15% =
31. 31.460 decreased by 15% =
32. 32.436 decreased by 75% =
33. 33.200 increased by 12% =
34. 34.744 increased by 75% =
35. 35.390 decreased by 20% =
36. 36.420 decreased by 15% =
37. 37.680 increased by 20% =
38. 38.425 increased by 8% =
39. 39.532 decreased by 75% =
40. 40.418 decreased by 50% =

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