Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 899 · 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. 1.570 decreased by 20% =
2. 2.470 decreased by 60% =
3. 3.650 increased by 8% =
4. 4.140 decreased by 30% =
5. 5.215 decreased by 40% =
6. 6.700 increased by 12% =
7. 7.40 decreased by 15% =
8. 8.180 decreased by 15% =
9. 9.88 decreased by 75% =
10. 10.625 increased by 8% =
11. 11.250 increased by 12% =
12. 12.700 increased by 8% =
13. 13.60 decreased by 40% =
14. 14.432 increased by 75% =
15. 15.560 decreased by 25% =
16. 16.40 increased by 20% =
17. 17.750 increased by 8% =
18. 18.280 increased by 20% =
19. 19.100 increased by 15% =
20. 20.710 increased by 20% =
21. 21.356 decreased by 50% =
22. 22.484 increased by 25% =
23. 23.330 increased by 30% =
24. 24.505 increased by 40% =
25. 25.250 decreased by 12% =
26. 26.630 decreased by 20% =
27. 27.608 decreased by 25% =
28. 28.210 increased by 10% =
29. 29.70 increased by 60% =
30. 30.60 decreased by 35% =
31. 31.410 increased by 30% =
32. 32.40 increased by 35% =
33. 33.50 increased by 8% =
34. 34.280 increased by 5% =
35. 35.56 increased by 75% =
36. 36.410 increased by 10% =
37. 37.180 decreased by 10% =
38. 38.540 increased by 40% =
39. 39.710 decreased by 60% =
40. 40.364 decreased by 50% =

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