Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 461 · 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. 1.680 decreased by 40% =
2. 2.260 decreased by 5% =
3. 3.330 decreased by 30% =
4. 4.110 increased by 10% =
5. 5.630 increased by 60% =
6. 6.404 increased by 75% =
7. 7.62 increased by 50% =
8. 8.690 decreased by 60% =
9. 9.604 decreased by 75% =
10. 10.800 increased by 40% =
11. 11.208 decreased by 25% =
12. 12.520 increased by 15% =
13. 13.428 increased by 75% =
14. 14.336 increased by 75% =
15. 15.220 increased by 35% =
16. 16.650 decreased by 8% =
17. 17.450 decreased by 12% =
18. 18.620 decreased by 35% =
19. 19.575 increased by 60% =
20. 20.720 increased by 35% =
21. 21.100 decreased by 15% =
22. 22.525 increased by 60% =
23. 23.660 decreased by 35% =
24. 24.644 increased by 25% =
25. 25.580 increased by 10% =
26. 26.680 decreased by 20% =
27. 27.600 decreased by 35% =
28. 28.216 increased by 75% =
29. 29.75 increased by 8% =
30. 30.250 increased by 30% =
31. 31.100 decreased by 35% =
32. 32.48 increased by 75% =
33. 33.400 decreased by 5% =
34. 34.720 decreased by 30% =
35. 35.125 decreased by 8% =
36. 36.420 increased by 10% =
37. 37.540 decreased by 50% =
38. 38.95 increased by 20% =
39. 39.445 decreased by 20% =
40. 40.280 decreased by 5% =

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