Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 779 · 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. 1.230 increased by 30% =
2. 2.320 decreased by 60% =
3. 3.180 increased by 15% =
4. 4.700 decreased by 8% =
5. 5.275 decreased by 12% =
6. 6.644 decreased by 25% =
7. 7.400 increased by 25% =
8. 8.130 decreased by 60% =
9. 9.500 increased by 60% =
10. 10.575 increased by 12% =
11. 11.505 decreased by 60% =
12. 12.450 decreased by 8% =
13. 13.720 increased by 35% =
14. 14.100 increased by 60% =
15. 15.310 decreased by 30% =
16. 16.690 decreased by 10% =
17. 17.444 increased by 75% =
18. 18.510 decreased by 10% =
19. 19.120 increased by 25% =
20. 20.100 increased by 5% =
21. 21.464 increased by 25% =
22. 22.120 decreased by 40% =
23. 23.210 increased by 60% =
24. 24.310 decreased by 30% =
25. 25.644 increased by 25% =
26. 26.250 increased by 40% =
27. 27.498 decreased by 50% =
28. 28.770 increased by 40% =
29. 29.484 increased by 75% =
30. 30.215 increased by 20% =
31. 31.500 decreased by 15% =
32. 32.760 decreased by 5% =
33. 33.322 increased by 50% =
34. 34.210 decreased by 60% =
35. 35.270 decreased by 30% =
36. 36.615 increased by 60% =
37. 37.770 decreased by 40% =
38. 38.234 increased by 50% =
39. 39.625 increased by 60% =
40. 40.360 increased by 10% =

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