Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 331 · 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. 1.300 decreased by 30% =
2. 2.180 increased by 5% =
3. 3.60 decreased by 5% =
4. 4.440 increased by 10% =
5. 5.700 increased by 40% =
6. 6.290 increased by 30% =
7. 7.60 decreased by 40% =
8. 8.150 increased by 50% =
9. 9.620 decreased by 5% =
10. 10.240 decreased by 15% =
11. 11.500 increased by 20% =
12. 12.735 decreased by 60% =
13. 13.196 increased by 75% =
14. 14.560 increased by 40% =
15. 15.740 decreased by 35% =
16. 16.40 increased by 5% =
17. 17.280 decreased by 30% =
18. 18.400 decreased by 10% =
19. 19.640 increased by 15% =
20. 20.600 decreased by 30% =
21. 21.250 decreased by 10% =
22. 22.552 increased by 50% =
23. 23.375 decreased by 8% =
24. 24.325 decreased by 8% =
25. 25.240 increased by 15% =
26. 26.300 increased by 5% =
27. 27.450 increased by 12% =
28. 28.50 increased by 8% =
29. 29.64 decreased by 25% =
30. 30.290 increased by 20% =
31. 31.624 increased by 50% =
32. 32.784 decreased by 75% =
33. 33.570 increased by 60% =
34. 34.260 decreased by 15% =
35. 35.280 increased by 20% =
36. 36.206 increased by 50% =
37. 37.625 increased by 8% =
38. 38.285 decreased by 40% =
39. 39.360 increased by 5% =
40. 40.40 decreased by 60% =

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