Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 237 · 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. 1.320 increased by 15% =
2. 2.400 increased by 15% =
3. 3.290 increased by 20% =
4. 4.380 increased by 35% =
5. 5.610 decreased by 10% =
6. 6.275 decreased by 12% =
7. 7.60 increased by 5% =
8. 8.780 increased by 35% =
9. 9.640 decreased by 5% =
10. 10.50 increased by 20% =
11. 11.284 increased by 25% =
12. 12.220 increased by 5% =
13. 13.180 increased by 15% =
14. 14.580 increased by 60% =
15. 15.656 increased by 75% =
16. 16.280 increased by 35% =
17. 17.320 decreased by 15% =
18. 18.500 increased by 12% =
19. 19.640 decreased by 10% =
20. 20.120 decreased by 60% =
21. 21.140 increased by 5% =
22. 22.640 increased by 5% =
23. 23.190 decreased by 10% =
24. 24.280 increased by 40% =
25. 25.780 increased by 60% =
26. 26.60 increased by 15% =
27. 27.68 decreased by 25% =
28. 28.620 increased by 50% =
29. 29.170 decreased by 10% =
30. 30.720 decreased by 15% =
31. 31.304 increased by 50% =
32. 32.180 increased by 40% =
33. 33.100 increased by 35% =
34. 34.550 decreased by 12% =
35. 35.215 decreased by 20% =
36. 36.700 increased by 20% =
37. 37.70 increased by 50% =
38. 38.800 increased by 40% =
39. 39.480 decreased by 35% =
40. 40.496 increased by 25% =

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