Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 545 · 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. 1.388 increased by 75% =
2. 2.75 increased by 20% =
3. 3.175 increased by 60% =
4. 4.230 decreased by 40% =
5. 5.400 decreased by 8% =
6. 6.520 decreased by 5% =
7. 7.210 decreased by 10% =
8. 8.428 decreased by 50% =
9. 9.460 increased by 30% =
10. 10.650 increased by 8% =
11. 11.145 increased by 60% =
12. 12.375 decreased by 8% =
13. 13.225 decreased by 12% =
14. 14.180 increased by 60% =
15. 15.40 increased by 5% =
16. 16.400 increased by 75% =
17. 17.110 increased by 20% =
18. 18.790 decreased by 60% =
19. 19.352 increased by 75% =
20. 20.645 decreased by 40% =
21. 21.800 increased by 12% =
22. 22.80 increased by 75% =
23. 23.240 increased by 5% =
24. 24.365 decreased by 60% =
25. 25.536 increased by 75% =
26. 26.200 increased by 40% =
27. 27.164 increased by 50% =
28. 28.800 increased by 30% =
29. 29.680 decreased by 30% =
30. 30.600 increased by 12% =
31. 31.525 increased by 8% =
32. 32.100 increased by 35% =
33. 33.700 increased by 5% =
34. 34.425 decreased by 8% =
35. 35.496 increased by 50% =
36. 36.588 increased by 25% =
37. 37.525 increased by 8% =
38. 38.518 increased by 50% =
39. 39.100 decreased by 12% =
40. 40.770 decreased by 10% =

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