Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 992 · 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. 1.570 increased by 10% =
2. 2.170 increased by 10% =
3. 3.360 decreased by 40% =
4. 4.720 increased by 20% =
5. 5.504 increased by 75% =
6. 6.120 decreased by 25% =
7. 7.230 decreased by 30% =
8. 8.600 decreased by 15% =
9. 9.622 decreased by 50% =
10. 10.155 increased by 40% =
11. 11.260 decreased by 35% =
12. 12.360 increased by 5% =
13. 13.128 decreased by 25% =
14. 14.175 decreased by 40% =
15. 15.540 decreased by 50% =
16. 16.180 decreased by 30% =
17. 17.380 increased by 5% =
18. 18.410 increased by 30% =
19. 19.160 increased by 5% =
20. 20.630 increased by 40% =
21. 21.160 decreased by 20% =
22. 22.740 decreased by 35% =
23. 23.230 increased by 30% =
24. 24.85 decreased by 20% =
25. 25.800 increased by 12% =
26. 26.100 increased by 12% =
27. 27.790 decreased by 40% =
28. 28.180 increased by 35% =
29. 29.510 increased by 60% =
30. 30.564 decreased by 50% =
31. 31.148 increased by 75% =
32. 32.305 increased by 20% =
33. 33.720 increased by 50% =
34. 34.180 increased by 15% =
35. 35.620 decreased by 5% =
36. 36.595 decreased by 40% =
37. 37.398 increased by 50% =
38. 38.420 increased by 35% =
39. 39.588 decreased by 75% =
40. 40.75 decreased by 12% =

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