Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 661 · 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. 1.230 increased by 10% =
2. 2.220 decreased by 15% =
3. 3.360 decreased by 35% =
4. 4.120 increased by 75% =
5. 5.650 decreased by 20% =
6. 6.100 decreased by 10% =
7. 7.584 increased by 75% =
8. 8.335 decreased by 40% =
9. 9.742 decreased by 50% =
10. 10.720 decreased by 75% =
11. 11.460 decreased by 5% =
12. 12.520 decreased by 10% =
13. 13.460 decreased by 15% =
14. 14.695 increased by 40% =
15. 15.255 increased by 60% =
16. 16.740 decreased by 15% =
17. 17.40 decreased by 60% =
18. 18.260 increased by 5% =
19. 19.550 increased by 50% =
20. 20.630 increased by 10% =
21. 21.50 increased by 10% =
22. 22.160 decreased by 15% =
23. 23.320 increased by 5% =
24. 24.465 increased by 20% =
25. 25.410 decreased by 10% =
26. 26.530 increased by 20% =
27. 27.140 increased by 15% =
28. 28.394 increased by 50% =
29. 29.420 decreased by 75% =
30. 30.455 increased by 60% =
31. 31.280 decreased by 40% =
32. 32.700 increased by 12% =
33. 33.140 decreased by 10% =
34. 34.600 increased by 8% =
35. 35.800 increased by 12% =
36. 36.375 decreased by 12% =
37. 37.550 decreased by 12% =
38. 38.700 increased by 5% =
39. 39.192 decreased by 25% =
40. 40.675 increased by 12% =

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