Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 57 · 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. 1.740 increased by 35% =
2. 2.230 increased by 20% =
3. 3.552 increased by 25% =
4. 4.510 decreased by 30% =
5. 5.176 decreased by 50% =
6. 6.400 increased by 8% =
7. 7.180 decreased by 5% =
8. 8.735 increased by 60% =
9. 9.720 increased by 35% =
10. 10.520 increased by 20% =
11. 11.560 increased by 30% =
12. 12.268 decreased by 75% =
13. 13.676 decreased by 75% =
14. 14.280 decreased by 15% =
15. 15.650 increased by 30% =
16. 16.320 decreased by 15% =
17. 17.314 decreased by 50% =
18. 18.184 increased by 25% =
19. 19.500 decreased by 75% =
20. 20.450 increased by 10% =
21. 21.400 decreased by 15% =
22. 22.160 increased by 15% =
23. 23.220 increased by 60% =
24. 24.130 decreased by 10% =
25. 25.75 increased by 8% =
26. 26.40 decreased by 75% =
27. 27.630 increased by 60% =
28. 28.800 decreased by 5% =
29. 29.675 decreased by 20% =
30. 30.628 increased by 50% =
31. 31.775 increased by 8% =
32. 32.650 increased by 12% =
33. 33.220 decreased by 5% =
34. 34.446 increased by 50% =
35. 35.620 decreased by 75% =
36. 36.484 decreased by 75% =
37. 37.180 increased by 25% =
38. 38.520 decreased by 25% =
39. 39.50 increased by 8% =
40. 40.512 increased by 50% =

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