Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 619 · 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. 1.780 increased by 30% =
2. 2.360 increased by 75% =
3. 3.100 increased by 8% =
4. 4.70 increased by 50% =
5. 5.600 increased by 12% =
6. 6.672 decreased by 75% =
7. 7.555 decreased by 60% =
8. 8.120 decreased by 60% =
9. 9.340 decreased by 30% =
10. 10.625 decreased by 40% =
11. 11.230 decreased by 10% =
12. 12.425 decreased by 12% =
13. 13.400 decreased by 15% =
14. 14.188 increased by 25% =
15. 15.280 increased by 35% =
16. 16.620 increased by 30% =
17. 17.260 increased by 15% =
18. 18.130 increased by 40% =
19. 19.594 decreased by 50% =
20. 20.710 increased by 30% =
21. 21.50 increased by 60% =
22. 22.60 increased by 15% =
23. 23.110 decreased by 10% =
24. 24.610 increased by 20% =
25. 25.300 decreased by 30% =
26. 26.444 decreased by 25% =
27. 27.532 increased by 25% =
28. 28.675 increased by 8% =
29. 29.40 decreased by 75% =
30. 30.370 decreased by 10% =
31. 31.40 decreased by 25% =
32. 32.272 increased by 25% =
33. 33.72 increased by 50% =
34. 34.172 increased by 75% =
35. 35.240 increased by 35% =
36. 36.270 decreased by 20% =
37. 37.616 increased by 25% =
38. 38.216 increased by 25% =
39. 39.392 increased by 50% =
40. 40.620 increased by 35% =

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