Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 552 · 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. 1.460 decreased by 10% =
2. 2.60 increased by 15% =
3. 3.320 decreased by 15% =
4. 4.220 increased by 75% =
5. 5.496 decreased by 25% =
6. 6.230 increased by 40% =
7. 7.550 increased by 8% =
8. 8.676 increased by 75% =
9. 9.580 decreased by 15% =
10. 10.330 decreased by 30% =
11. 11.425 increased by 8% =
12. 12.190 decreased by 40% =
13. 13.300 decreased by 35% =
14. 14.625 increased by 12% =
15. 15.680 increased by 10% =
16. 16.625 increased by 12% =
17. 17.300 decreased by 12% =
18. 18.660 decreased by 5% =
19. 19.80 increased by 10% =
20. 20.705 decreased by 40% =
21. 21.45 increased by 20% =
22. 22.144 increased by 75% =
23. 23.100 decreased by 35% =
24. 24.435 decreased by 20% =
25. 25.540 decreased by 35% =
26. 26.350 decreased by 12% =
27. 27.100 increased by 60% =
28. 28.740 decreased by 15% =
29. 29.100 decreased by 35% =
30. 30.700 increased by 60% =
31. 31.425 increased by 12% =
32. 32.465 increased by 40% =
33. 33.500 decreased by 12% =
34. 34.550 increased by 30% =
35. 35.720 decreased by 5% =
36. 36.780 decreased by 60% =
37. 37.88 increased by 75% =
38. 38.620 increased by 5% =
39. 39.132 decreased by 25% =
40. 40.280 increased by 60% =

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