Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 624 · 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. 1.170 decreased by 50% =
2. 2.446 decreased by 50% =
3. 3.455 decreased by 60% =
4. 4.630 increased by 20% =
5. 5.400 increased by 5% =
6. 6.675 decreased by 12% =
7. 7.645 increased by 40% =
8. 8.748 decreased by 50% =
9. 9.440 increased by 30% =
10. 10.700 decreased by 8% =
11. 11.684 decreased by 25% =
12. 12.140 decreased by 35% =
13. 13.680 increased by 30% =
14. 14.540 increased by 15% =
15. 15.180 increased by 15% =
16. 16.680 decreased by 35% =
17. 17.220 increased by 10% =
18. 18.224 increased by 75% =
19. 19.75 decreased by 8% =
20. 20.665 increased by 60% =
21. 21.644 decreased by 75% =
22. 22.588 increased by 75% =
23. 23.340 decreased by 10% =
24. 24.450 decreased by 12% =
25. 25.200 decreased by 35% =
26. 26.200 decreased by 12% =
27. 27.180 increased by 10% =
28. 28.630 increased by 40% =
29. 29.360 decreased by 15% =
30. 30.450 decreased by 12% =
31. 31.148 increased by 75% =
32. 32.450 increased by 12% =
33. 33.484 increased by 25% =
34. 34.300 increased by 75% =
35. 35.280 decreased by 35% =
36. 36.80 increased by 15% =
37. 37.60 decreased by 10% =
38. 38.140 increased by 10% =
39. 39.50 decreased by 20% =
40. 40.310 decreased by 10% =

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