Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 43 · 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. 1.300 increased by 8% =
2. 2.770 increased by 10% =
3. 3.190 decreased by 30% =
4. 4.170 increased by 40% =
5. 5.460 increased by 10% =
6. 6.550 increased by 8% =
7. 7.160 increased by 5% =
8. 8.575 increased by 60% =
9. 9.206 increased by 50% =
10. 10.280 increased by 15% =
11. 11.740 increased by 35% =
12. 12.675 increased by 20% =
13. 13.276 decreased by 50% =
14. 14.190 increased by 60% =
15. 15.170 decreased by 30% =
16. 16.380 increased by 50% =
17. 17.460 decreased by 35% =
18. 18.220 decreased by 5% =
19. 19.425 decreased by 12% =
20. 20.140 increased by 15% =
21. 21.410 increased by 20% =
22. 22.40 increased by 5% =
23. 23.270 increased by 10% =
24. 24.640 increased by 15% =
25. 25.95 increased by 40% =
26. 26.420 increased by 10% =
27. 27.124 decreased by 25% =
28. 28.380 increased by 50% =
29. 29.710 increased by 30% =
30. 30.240 decreased by 20% =
31. 31.152 decreased by 50% =
32. 32.720 increased by 35% =
33. 33.345 increased by 40% =
34. 34.170 increased by 40% =
35. 35.290 increased by 10% =
36. 36.700 increased by 15% =
37. 37.200 increased by 12% =
38. 38.240 increased by 5% =
39. 39.244 decreased by 75% =
40. 40.200 increased by 10% =

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