Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 14 · 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. 1.80 increased by 15% =
2. 2.736 increased by 75% =
3. 3.550 decreased by 8% =
4. 4.395 decreased by 60% =
5. 5.600 decreased by 60% =
6. 6.75 increased by 8% =
7. 7.515 increased by 60% =
8. 8.165 increased by 60% =
9. 9.664 increased by 75% =
10. 10.252 increased by 75% =
11. 11.450 increased by 12% =
12. 12.640 decreased by 15% =
13. 13.550 decreased by 8% =
14. 14.668 increased by 75% =
15. 15.414 decreased by 50% =
16. 16.700 decreased by 8% =
17. 17.320 increased by 40% =
18. 18.740 increased by 5% =
19. 19.450 decreased by 8% =
20. 20.280 increased by 35% =
21. 21.460 decreased by 35% =
22. 22.640 decreased by 60% =
23. 23.505 increased by 20% =
24. 24.650 increased by 12% =
25. 25.60 increased by 30% =
26. 26.415 increased by 40% =
27. 27.300 decreased by 12% =
28. 28.800 increased by 35% =
29. 29.180 increased by 15% =
30. 30.44 decreased by 25% =
31. 31.564 increased by 75% =
32. 32.800 decreased by 12% =
33. 33.218 decreased by 50% =
34. 34.270 decreased by 30% =
35. 35.160 decreased by 15% =
36. 36.800 increased by 8% =
37. 37.690 decreased by 10% =
38. 38.580 increased by 35% =
39. 39.590 increased by 30% =
40. 40.425 increased by 12% =

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