Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 615 · 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. 1.330 decreased by 40% =
2. 2.620 decreased by 5% =
3. 3.290 increased by 40% =
4. 4.680 decreased by 5% =
5. 5.700 decreased by 35% =
6. 6.665 decreased by 20% =
7. 7.480 increased by 30% =
8. 8.708 increased by 25% =
9. 9.620 increased by 30% =
10. 10.800 decreased by 10% =
11. 11.690 decreased by 10% =
12. 12.180 decreased by 15% =
13. 13.200 decreased by 20% =
14. 14.340 decreased by 15% =
15. 15.660 increased by 5% =
16. 16.120 increased by 75% =
17. 17.620 increased by 15% =
18. 18.580 increased by 75% =
19. 19.194 decreased by 50% =
20. 20.115 increased by 20% =
21. 21.304 increased by 75% =
22. 22.565 increased by 60% =
23. 23.660 decreased by 40% =
24. 24.550 increased by 20% =
25. 25.350 increased by 60% =
26. 26.728 increased by 75% =
27. 27.475 decreased by 8% =
28. 28.720 decreased by 30% =
29. 29.764 decreased by 50% =
30. 30.628 decreased by 25% =
31. 31.148 increased by 25% =
32. 32.800 increased by 75% =
33. 33.85 decreased by 40% =
34. 34.640 decreased by 25% =
35. 35.140 decreased by 15% =
36. 36.280 decreased by 15% =
37. 37.780 increased by 30% =
38. 38.440 decreased by 25% =
39. 39.140 increased by 15% =
40. 40.335 increased by 60% =

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