Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 279 · 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. 1.155 increased by 60% =
2. 2.180 increased by 5% =
3. 3.260 decreased by 15% =
4. 4.240 increased by 35% =
5. 5.640 increased by 35% =
6. 6.450 decreased by 12% =
7. 7.200 increased by 20% =
8. 8.225 decreased by 8% =
9. 9.690 increased by 10% =
10. 10.628 increased by 25% =
11. 11.550 increased by 30% =
12. 12.644 increased by 25% =
13. 13.232 increased by 25% =
14. 14.500 increased by 8% =
15. 15.450 decreased by 8% =
16. 16.220 decreased by 20% =
17. 17.240 increased by 30% =
18. 18.580 decreased by 30% =
19. 19.600 increased by 5% =
20. 20.600 increased by 60% =
21. 21.700 increased by 5% =
22. 22.780 increased by 15% =
23. 23.280 decreased by 30% =
24. 24.570 decreased by 60% =
25. 25.700 decreased by 12% =
26. 26.200 decreased by 5% =
27. 27.100 decreased by 8% =
28. 28.275 decreased by 8% =
29. 29.705 increased by 20% =
30. 30.340 increased by 10% =
31. 31.660 increased by 5% =
32. 32.300 increased by 40% =
33. 33.340 increased by 5% =
34. 34.672 increased by 75% =
35. 35.574 increased by 50% =
36. 36.630 decreased by 60% =
37. 37.260 decreased by 20% =
38. 38.375 decreased by 8% =
39. 39.480 increased by 15% =
40. 40.748 decreased by 50% =

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