Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 726 · 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. 1.440 decreased by 15% =
2. 2.700 decreased by 35% =
3. 3.48 increased by 75% =
4. 4.292 increased by 50% =
5. 5.80 increased by 30% =
6. 6.740 decreased by 75% =
7. 7.220 increased by 15% =
8. 8.780 increased by 15% =
9. 9.510 decreased by 10% =
10. 10.496 decreased by 50% =
11. 11.748 decreased by 25% =
12. 12.345 increased by 20% =
13. 13.275 decreased by 12% =
14. 14.90 decreased by 10% =
15. 15.420 increased by 40% =
16. 16.635 decreased by 20% =
17. 17.685 increased by 40% =
18. 18.150 decreased by 40% =
19. 19.160 decreased by 5% =
20. 20.700 decreased by 40% =
21. 21.200 increased by 5% =
22. 22.500 decreased by 5% =
23. 23.280 increased by 30% =
24. 24.215 increased by 20% =
25. 25.160 decreased by 15% =
26. 26.460 decreased by 10% =
27. 27.140 decreased by 40% =
28. 28.610 decreased by 10% =
29. 29.80 increased by 15% =
30. 30.175 decreased by 12% =
31. 31.150 decreased by 30% =
32. 32.716 decreased by 75% =
33. 33.618 increased by 50% =
34. 34.400 increased by 5% =
35. 35.300 increased by 15% =
36. 36.180 increased by 5% =
37. 37.75 increased by 12% =
38. 38.352 decreased by 75% =
39. 39.620 increased by 25% =
40. 40.720 decreased by 15% =

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