Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 998 · 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. 1.480 increased by 15% =
2. 2.460 decreased by 15% =
3. 3.620 decreased by 5% =
4. 4.200 decreased by 30% =
5. 5.750 decreased by 30% =
6. 6.140 increased by 5% =
7. 7.240 decreased by 35% =
8. 8.400 increased by 40% =
9. 9.200 increased by 15% =
10. 10.775 increased by 12% =
11. 11.230 increased by 30% =
12. 12.80 decreased by 35% =
13. 13.80 increased by 35% =
14. 14.240 increased by 30% =
15. 15.636 decreased by 50% =
16. 16.400 increased by 15% =
17. 17.375 increased by 12% =
18. 18.360 decreased by 35% =
19. 19.332 increased by 75% =
20. 20.720 increased by 15% =
21. 21.90 increased by 30% =
22. 22.620 decreased by 5% =
23. 23.790 increased by 40% =
24. 24.110 decreased by 50% =
25. 25.360 decreased by 40% =
26. 26.200 decreased by 12% =
27. 27.730 decreased by 30% =
28. 28.528 decreased by 75% =
29. 29.175 increased by 60% =
30. 30.730 increased by 10% =
31. 31.132 increased by 25% =
32. 32.60 increased by 60% =
33. 33.530 decreased by 20% =
34. 34.450 decreased by 10% =
35. 35.40 increased by 15% =
36. 36.660 decreased by 20% =
37. 37.484 decreased by 75% =
38. 38.340 decreased by 35% =
39. 39.45 decreased by 60% =
40. 40.90 decreased by 20% =

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