Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 324 · 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. 1.452 increased by 25% =
2. 2.290 decreased by 10% =
3. 3.172 decreased by 50% =
4. 4.620 decreased by 30% =
5. 5.140 increased by 15% =
6. 6.136 decreased by 25% =
7. 7.160 increased by 40% =
8. 8.675 increased by 12% =
9. 9.520 decreased by 5% =
10. 10.275 decreased by 12% =
11. 11.492 increased by 75% =
12. 12.250 increased by 10% =
13. 13.148 increased by 25% =
14. 14.800 decreased by 5% =
15. 15.60 increased by 20% =
16. 16.245 decreased by 40% =
17. 17.700 increased by 25% =
18. 18.275 increased by 12% =
19. 19.640 decreased by 5% =
20. 20.720 decreased by 5% =
21. 21.64 decreased by 75% =
22. 22.340 decreased by 5% =
23. 23.220 increased by 75% =
24. 24.212 increased by 25% =
25. 25.800 increased by 8% =
26. 26.400 decreased by 35% =
27. 27.340 increased by 35% =
28. 28.710 decreased by 30% =
29. 29.720 decreased by 5% =
30. 30.540 decreased by 10% =
31. 31.580 increased by 50% =
32. 32.72 increased by 75% =
33. 33.590 increased by 30% =
34. 34.640 increased by 5% =
35. 35.405 decreased by 40% =
36. 36.200 decreased by 30% =
37. 37.800 decreased by 35% =
38. 38.690 increased by 10% =
39. 39.160 decreased by 75% =
40. 40.215 increased by 40% =

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