Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 133 · 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. 1.400 increased by 8% =
2. 2.112 decreased by 75% =
3. 3.325 decreased by 8% =
4. 4.50 increased by 20% =
5. 5.720 increased by 5% =
6. 6.220 decreased by 5% =
7. 7.780 decreased by 75% =
8. 8.800 decreased by 15% =
9. 9.360 decreased by 15% =
10. 10.735 decreased by 20% =
11. 11.340 decreased by 15% =
12. 12.250 increased by 10% =
13. 13.60 decreased by 40% =
14. 14.110 increased by 10% =
15. 15.710 decreased by 10% =
16. 16.400 decreased by 35% =
17. 17.40 increased by 35% =
18. 18.350 increased by 8% =
19. 19.300 increased by 12% =
20. 20.240 increased by 5% =
21. 21.300 increased by 25% =
22. 22.100 increased by 35% =
23. 23.620 decreased by 60% =
24. 24.50 decreased by 12% =
25. 25.80 decreased by 35% =
26. 26.130 increased by 20% =
27. 27.92 increased by 25% =
28. 28.230 increased by 50% =
29. 29.240 increased by 10% =
30. 30.585 increased by 40% =
31. 31.580 increased by 10% =
32. 32.345 decreased by 40% =
33. 33.480 decreased by 75% =
34. 34.200 decreased by 8% =
35. 35.175 decreased by 8% =
36. 36.440 increased by 20% =
37. 37.50 decreased by 20% =
38. 38.72 decreased by 25% =
39. 39.740 decreased by 5% =
40. 40.370 increased by 30% =

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