Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 801 · 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. 1.234 increased by 50% =
2. 2.288 increased by 25% =
3. 3.250 decreased by 30% =
4. 4.590 decreased by 30% =
5. 5.700 decreased by 5% =
6. 6.484 decreased by 75% =
7. 7.84 increased by 75% =
8. 8.400 decreased by 60% =
9. 9.520 increased by 35% =
10. 10.200 decreased by 8% =
11. 11.250 increased by 8% =
12. 12.115 increased by 40% =
13. 13.730 increased by 60% =
14. 14.680 decreased by 5% =
15. 15.80 increased by 15% =
16. 16.600 decreased by 12% =
17. 17.254 decreased by 50% =
18. 18.140 increased by 35% =
19. 19.385 decreased by 60% =
20. 20.100 increased by 60% =
21. 21.725 decreased by 20% =
22. 22.250 increased by 10% =
23. 23.720 decreased by 15% =
24. 24.745 decreased by 60% =
25. 25.120 increased by 30% =
26. 26.100 decreased by 8% =
27. 27.115 decreased by 60% =
28. 28.625 increased by 8% =
29. 29.460 increased by 10% =
30. 30.550 increased by 50% =
31. 31.50 decreased by 8% =
32. 32.650 increased by 12% =
33. 33.140 decreased by 30% =
34. 34.750 decreased by 12% =
35. 35.128 increased by 75% =
36. 36.180 increased by 60% =
37. 37.540 increased by 15% =
38. 38.640 increased by 30% =
39. 39.425 increased by 40% =
40. 40.620 decreased by 35% =

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