Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 334 · 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 12% =
2. 2.180 increased by 35% =
3. 3.100 increased by 60% =
4. 4.575 increased by 12% =
5. 5.125 increased by 8% =
6. 6.164 increased by 75% =
7. 7.422 increased by 50% =
8. 8.390 decreased by 10% =
9. 9.750 increased by 12% =
10. 10.40 increased by 10% =
11. 11.392 decreased by 25% =
12. 12.800 decreased by 35% =
13. 13.80 increased by 10% =
14. 14.472 decreased by 25% =
15. 15.250 decreased by 50% =
16. 16.184 increased by 75% =
17. 17.195 decreased by 20% =
18. 18.300 decreased by 8% =
19. 19.540 decreased by 5% =
20. 20.44 increased by 25% =
21. 21.284 increased by 25% =
22. 22.40 increased by 15% =
23. 23.548 increased by 25% =
24. 24.220 decreased by 15% =
25. 25.436 increased by 25% =
26. 26.112 decreased by 75% =
27. 27.750 increased by 10% =
28. 28.356 increased by 25% =
29. 29.160 increased by 5% =
30. 30.150 increased by 12% =
31. 31.540 increased by 30% =
32. 32.120 decreased by 15% =
33. 33.430 decreased by 30% =
34. 34.756 increased by 75% =
35. 35.175 decreased by 20% =
36. 36.350 decreased by 40% =
37. 37.580 decreased by 15% =
38. 38.490 increased by 30% =
39. 39.244 decreased by 75% =
40. 40.630 increased by 10% =

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