Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 228 · 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. 1.220 decreased by 10% =
2. 2.520 increased by 15% =
3. 3.730 decreased by 10% =
4. 4.380 decreased by 30% =
5. 5.628 decreased by 75% =
6. 6.760 increased by 30% =
7. 7.350 increased by 12% =
8. 8.150 decreased by 12% =
9. 9.780 decreased by 15% =
10. 10.260 decreased by 60% =
11. 11.500 increased by 10% =
12. 12.244 increased by 75% =
13. 13.320 increased by 15% =
14. 14.384 increased by 75% =
15. 15.350 decreased by 10% =
16. 16.320 decreased by 50% =
17. 17.305 decreased by 60% =
18. 18.300 decreased by 20% =
19. 19.168 decreased by 75% =
20. 20.142 increased by 50% =
21. 21.85 decreased by 40% =
22. 22.60 increased by 60% =
23. 23.600 decreased by 30% =
24. 24.220 decreased by 35% =
25. 25.70 decreased by 10% =
26. 26.500 increased by 60% =
27. 27.100 increased by 10% =
28. 28.675 increased by 8% =
29. 29.60 increased by 35% =
30. 30.400 increased by 60% =
31. 31.90 increased by 30% =
32. 32.90 increased by 60% =
33. 33.750 increased by 8% =
34. 34.400 increased by 50% =
35. 35.500 increased by 35% =
36. 36.320 increased by 35% =
37. 37.340 decreased by 40% =
38. 38.550 increased by 30% =
39. 39.700 decreased by 35% =
40. 40.740 increased by 35% =

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