Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 574 · 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. 1.710 increased by 30% =
2. 2.182 decreased by 50% =
3. 3.710 increased by 30% =
4. 4.270 increased by 60% =
5. 5.320 decreased by 35% =
6. 6.588 increased by 25% =
7. 7.220 decreased by 10% =
8. 8.680 increased by 5% =
9. 9.650 increased by 8% =
10. 10.125 increased by 8% =
11. 11.720 decreased by 35% =
12. 12.52 decreased by 50% =
13. 13.660 decreased by 5% =
14. 14.270 decreased by 40% =
15. 15.524 decreased by 25% =
16. 16.240 increased by 10% =
17. 17.740 increased by 5% =
18. 18.175 increased by 12% =
19. 19.160 decreased by 35% =
20. 20.300 increased by 15% =
21. 21.240 increased by 60% =
22. 22.475 increased by 60% =
23. 23.800 decreased by 15% =
24. 24.140 decreased by 30% =
25. 25.800 increased by 10% =
26. 26.178 increased by 50% =
27. 27.580 decreased by 35% =
28. 28.135 increased by 40% =
29. 29.180 increased by 15% =
30. 30.460 decreased by 40% =
31. 31.92 increased by 75% =
32. 32.552 increased by 75% =
33. 33.135 decreased by 60% =
34. 34.360 increased by 5% =
35. 35.260 decreased by 50% =
36. 36.600 increased by 15% =
37. 37.270 increased by 40% =
38. 38.400 increased by 35% =
39. 39.250 decreased by 12% =
40. 40.400 increased by 8% =

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