Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 339 · 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. 1.270 increased by 30% =
2. 2.524 decreased by 50% =
3. 3.268 increased by 75% =
4. 4.310 decreased by 30% =
5. 5.698 decreased by 50% =
6. 6.560 decreased by 35% =
7. 7.205 increased by 40% =
8. 8.340 decreased by 30% =
9. 9.225 increased by 12% =
10. 10.120 increased by 60% =
11. 11.704 decreased by 75% =
12. 12.780 increased by 15% =
13. 13.248 increased by 25% =
14. 14.608 increased by 75% =
15. 15.300 increased by 35% =
16. 16.184 increased by 50% =
17. 17.420 decreased by 5% =
18. 18.310 increased by 30% =
19. 19.400 increased by 25% =
20. 20.100 increased by 40% =
21. 21.394 decreased by 50% =
22. 22.130 decreased by 20% =
23. 23.86 decreased by 50% =
24. 24.230 decreased by 40% =
25. 25.360 increased by 35% =
26. 26.220 decreased by 30% =
27. 27.150 increased by 30% =
28. 28.64 increased by 25% =
29. 29.252 increased by 75% =
30. 30.705 decreased by 20% =
31. 31.64 increased by 75% =
32. 32.50 increased by 8% =
33. 33.740 decreased by 60% =
34. 34.700 decreased by 10% =
35. 35.568 increased by 25% =
36. 36.360 increased by 15% =
37. 37.400 increased by 15% =
38. 38.375 increased by 12% =
39. 39.700 increased by 8% =
40. 40.695 increased by 20% =

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