Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 999 · 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. 1.630 decreased by 40% =
2. 2.276 increased by 75% =
3. 3.790 decreased by 10% =
4. 4.600 increased by 40% =
5. 5.740 decreased by 35% =
6. 6.435 decreased by 60% =
7. 7.450 increased by 30% =
8. 8.230 decreased by 10% =
9. 9.60 decreased by 5% =
10. 10.630 increased by 30% =
11. 11.480 increased by 5% =
12. 12.625 decreased by 60% =
13. 13.100 increased by 12% =
14. 14.275 increased by 12% =
15. 15.125 decreased by 12% =
16. 16.75 decreased by 20% =
17. 17.420 decreased by 5% =
18. 18.260 increased by 35% =
19. 19.680 decreased by 5% =
20. 20.754 decreased by 50% =
21. 21.520 decreased by 15% =
22. 22.610 increased by 30% =
23. 23.700 decreased by 15% =
24. 24.790 increased by 30% =
25. 25.268 decreased by 25% =
26. 26.212 increased by 25% =
27. 27.60 decreased by 25% =
28. 28.160 increased by 5% =
29. 29.310 decreased by 20% =
30. 30.50 increased by 10% =
31. 31.175 increased by 12% =
32. 32.675 decreased by 8% =
33. 33.150 decreased by 40% =
34. 34.260 decreased by 10% =
35. 35.60 decreased by 35% =
36. 36.790 increased by 30% =
37. 37.100 decreased by 8% =
38. 38.280 increased by 60% =
39. 39.800 decreased by 35% =
40. 40.144 increased by 25% =

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