Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 793 · 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. 1.200 decreased by 8% =
2. 2.236 increased by 75% =
3. 3.388 increased by 25% =
4. 4.210 decreased by 10% =
5. 5.420 increased by 30% =
6. 6.270 increased by 30% =
7. 7.720 decreased by 40% =
8. 8.200 decreased by 35% =
9. 9.685 decreased by 20% =
10. 10.512 increased by 75% =
11. 11.540 decreased by 30% =
12. 12.620 increased by 75% =
13. 13.180 decreased by 5% =
14. 14.725 increased by 12% =
15. 15.700 increased by 20% =
16. 16.180 decreased by 30% =
17. 17.100 increased by 15% =
18. 18.740 increased by 5% =
19. 19.220 decreased by 15% =
20. 20.72 decreased by 75% =
21. 21.320 increased by 35% =
22. 22.192 increased by 25% =
23. 23.350 increased by 40% =
24. 24.50 decreased by 12% =
25. 25.375 increased by 20% =
26. 26.250 decreased by 10% =
27. 27.200 increased by 75% =
28. 28.100 increased by 15% =
29. 29.664 increased by 75% =
30. 30.800 increased by 12% =
31. 31.670 decreased by 30% =
32. 32.664 increased by 75% =
33. 33.100 increased by 12% =
34. 34.146 increased by 50% =
35. 35.150 increased by 12% =
36. 36.370 increased by 20% =
37. 37.800 decreased by 35% =
38. 38.90 increased by 10% =
39. 39.720 decreased by 60% =
40. 40.360 increased by 15% =

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