Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 834 · 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. 1.70 increased by 20% =
2. 2.400 decreased by 12% =
3. 3.80 increased by 35% =
4. 4.200 increased by 12% =
5. 5.340 decreased by 30% =
6. 6.280 decreased by 10% =
7. 7.715 increased by 20% =
8. 8.376 increased by 75% =
9. 9.725 increased by 12% =
10. 10.628 decreased by 25% =
11. 11.80 decreased by 30% =
12. 12.140 increased by 5% =
13. 13.140 increased by 15% =
14. 14.750 increased by 30% =
15. 15.390 increased by 10% =
16. 16.250 decreased by 20% =
17. 17.320 decreased by 15% =
18. 18.184 decreased by 75% =
19. 19.350 increased by 30% =
20. 20.580 decreased by 5% =
21. 21.575 increased by 8% =
22. 22.578 increased by 50% =
23. 23.800 increased by 12% =
24. 24.40 decreased by 40% =
25. 25.550 increased by 8% =
26. 26.665 decreased by 20% =
27. 27.500 increased by 5% =
28. 28.500 increased by 10% =
29. 29.450 decreased by 20% =
30. 30.352 decreased by 75% =
31. 31.270 decreased by 30% =
32. 32.620 increased by 30% =
33. 33.440 decreased by 5% =
34. 34.100 decreased by 12% =
35. 35.740 increased by 10% =
36. 36.372 increased by 25% =
37. 37.750 increased by 8% =
38. 38.700 decreased by 60% =
39. 39.680 increased by 15% =
40. 40.700 decreased by 10% =

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