Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 608 · 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. 1.175 decreased by 8% =
2. 2.644 decreased by 75% =
3. 3.290 decreased by 30% =
4. 4.800 increased by 15% =
5. 5.75 increased by 12% =
6. 6.120 increased by 60% =
7. 7.420 decreased by 15% =
8. 8.665 decreased by 60% =
9. 9.340 increased by 10% =
10. 10.600 decreased by 12% =
11. 11.685 increased by 20% =
12. 12.780 increased by 25% =
13. 13.160 increased by 15% =
14. 14.55 increased by 40% =
15. 15.640 decreased by 35% =
16. 16.648 decreased by 75% =
17. 17.360 increased by 40% =
18. 18.748 increased by 25% =
19. 19.600 decreased by 15% =
20. 20.530 decreased by 10% =
21. 21.785 increased by 60% =
22. 22.290 decreased by 10% =
23. 23.200 decreased by 30% =
24. 24.630 decreased by 40% =
25. 25.800 increased by 8% =
26. 26.495 decreased by 20% =
27. 27.635 increased by 40% =
28. 28.740 increased by 15% =
29. 29.545 increased by 20% =
30. 30.164 decreased by 50% =
31. 31.460 decreased by 15% =
32. 32.280 increased by 5% =
33. 33.156 increased by 75% =
34. 34.470 decreased by 10% =
35. 35.360 decreased by 40% =
36. 36.130 increased by 30% =
37. 37.300 decreased by 8% =
38. 38.672 decreased by 25% =
39. 39.700 decreased by 20% =
40. 40.595 decreased by 60% =

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