Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 60 · 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. 1.360 increased by 15% =
2. 2.120 increased by 35% =
3. 3.140 increased by 5% =
4. 4.276 increased by 50% =
5. 5.560 increased by 5% =
6. 6.485 decreased by 20% =
7. 7.435 decreased by 20% =
8. 8.600 decreased by 15% =
9. 9.640 increased by 30% =
10. 10.225 increased by 12% =
11. 11.190 decreased by 60% =
12. 12.700 decreased by 10% =
13. 13.415 increased by 20% =
14. 14.476 increased by 25% =
15. 15.120 increased by 30% =
16. 16.50 increased by 12% =
17. 17.425 decreased by 60% =
18. 18.735 decreased by 20% =
19. 19.702 decreased by 50% =
20. 20.550 decreased by 8% =
21. 21.280 decreased by 5% =
22. 22.745 decreased by 60% =
23. 23.105 decreased by 20% =
24. 24.700 increased by 10% =
25. 25.620 decreased by 5% =
26. 26.170 increased by 40% =
27. 27.785 decreased by 40% =
28. 28.660 increased by 5% =
29. 29.55 increased by 60% =
30. 30.236 decreased by 75% =
31. 31.240 decreased by 5% =
32. 32.700 decreased by 15% =
33. 33.500 increased by 8% =
34. 34.335 decreased by 60% =
35. 35.600 decreased by 12% =
36. 36.260 increased by 5% =
37. 37.60 decreased by 35% =
38. 38.340 decreased by 10% =
39. 39.165 increased by 20% =
40. 40.800 decreased by 12% =

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