Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 15 · 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. 1.708 decreased by 25% =
2. 2.720 increased by 15% =
3. 3.445 increased by 60% =
4. 4.675 decreased by 8% =
5. 5.520 increased by 35% =
6. 6.688 increased by 75% =
7. 7.430 decreased by 30% =
8. 8.545 decreased by 60% =
9. 9.440 decreased by 5% =
10. 10.550 decreased by 12% =
11. 11.700 increased by 30% =
12. 12.250 increased by 40% =
13. 13.580 decreased by 15% =
14. 14.488 increased by 50% =
15. 15.750 decreased by 8% =
16. 16.774 decreased by 50% =
17. 17.95 decreased by 40% =
18. 18.464 increased by 75% =
19. 19.130 decreased by 30% =
20. 20.170 increased by 10% =
21. 21.160 increased by 15% =
22. 22.320 decreased by 60% =
23. 23.96 increased by 25% =
24. 24.750 decreased by 8% =
25. 25.370 increased by 50% =
26. 26.250 decreased by 10% =
27. 27.450 increased by 30% =
28. 28.296 increased by 75% =
29. 29.70 decreased by 30% =
30. 30.700 increased by 8% =
31. 31.335 decreased by 60% =
32. 32.40 increased by 35% =
33. 33.800 increased by 10% =
34. 34.230 increased by 40% =
35. 35.160 decreased by 5% =
36. 36.100 increased by 5% =
37. 37.800 increased by 35% =
38. 38.150 decreased by 12% =
39. 39.680 decreased by 35% =
40. 40.380 decreased by 15% =

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