Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 424 · 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. 1.160 increased by 10% =
2. 2.410 increased by 30% =
3. 3.284 decreased by 25% =
4. 4.60 decreased by 5% =
5. 5.260 decreased by 5% =
6. 6.685 increased by 20% =
7. 7.210 increased by 30% =
8. 8.340 increased by 5% =
9. 9.675 decreased by 12% =
10. 10.100 increased by 12% =
11. 11.525 increased by 12% =
12. 12.560 increased by 60% =
13. 13.110 increased by 40% =
14. 14.690 increased by 20% =
15. 15.280 decreased by 15% =
16. 16.80 decreased by 60% =
17. 17.650 increased by 40% =
18. 18.320 increased by 75% =
19. 19.720 increased by 30% =
20. 20.640 increased by 50% =
21. 21.745 increased by 60% =
22. 22.350 decreased by 40% =
23. 23.400 increased by 8% =
24. 24.330 increased by 40% =
25. 25.264 increased by 25% =
26. 26.250 decreased by 10% =
27. 27.368 increased by 50% =
28. 28.800 decreased by 35% =
29. 29.245 increased by 20% =
30. 30.100 decreased by 15% =
31. 31.280 increased by 15% =
32. 32.580 increased by 20% =
33. 33.100 increased by 5% =
34. 34.390 increased by 10% =
35. 35.716 decreased by 75% =
36. 36.500 decreased by 8% =
37. 37.375 decreased by 8% =
38. 38.260 increased by 5% =
39. 39.780 increased by 30% =
40. 40.225 increased by 8% =

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