Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 851 · 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. 1.120 decreased by 15% =
2. 2.620 increased by 10% =
3. 3.175 decreased by 12% =
4. 4.60 decreased by 35% =
5. 5.476 decreased by 75% =
6. 6.720 decreased by 5% =
7. 7.380 increased by 5% =
8. 8.348 decreased by 50% =
9. 9.350 decreased by 8% =
10. 10.330 increased by 20% =
11. 11.560 decreased by 20% =
12. 12.180 decreased by 15% =
13. 13.768 increased by 75% =
14. 14.140 decreased by 10% =
15. 15.140 increased by 35% =
16. 16.180 decreased by 15% =
17. 17.395 decreased by 20% =
18. 18.500 increased by 35% =
19. 19.740 decreased by 35% =
20. 20.580 increased by 15% =
21. 21.570 decreased by 40% =
22. 22.576 decreased by 25% =
23. 23.406 increased by 50% =
24. 24.488 decreased by 25% =
25. 25.440 increased by 35% =
26. 26.488 increased by 75% =
27. 27.220 decreased by 75% =
28. 28.712 increased by 50% =
29. 29.275 decreased by 12% =
30. 30.460 decreased by 10% =
31. 31.280 increased by 35% =
32. 32.304 decreased by 75% =
33. 33.540 increased by 35% =
34. 34.620 increased by 60% =
35. 35.610 increased by 10% =
36. 36.340 decreased by 15% =
37. 37.700 decreased by 8% =
38. 38.276 increased by 75% =
39. 39.720 increased by 5% =
40. 40.555 increased by 20% =

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