Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 880 · 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. 1.400 increased by 75% =
2. 2.150 decreased by 10% =
3. 3.90 decreased by 20% =
4. 4.700 decreased by 10% =
5. 5.730 decreased by 20% =
6. 6.225 decreased by 12% =
7. 7.246 increased by 50% =
8. 8.435 increased by 40% =
9. 9.60 decreased by 20% =
10. 10.675 increased by 12% =
11. 11.104 increased by 25% =
12. 12.550 increased by 12% =
13. 13.550 increased by 10% =
14. 14.488 increased by 25% =
15. 15.530 decreased by 10% =
16. 16.665 decreased by 60% =
17. 17.600 decreased by 15% =
18. 18.260 decreased by 10% =
19. 19.300 increased by 35% =
20. 20.280 increased by 5% =
21. 21.400 decreased by 8% =
22. 22.485 decreased by 60% =
23. 23.40 increased by 15% =
24. 24.795 increased by 60% =
25. 25.60 decreased by 30% =
26. 26.700 increased by 12% =
27. 27.270 decreased by 30% =
28. 28.544 increased by 25% =
29. 29.236 increased by 50% =
30. 30.330 decreased by 10% =
31. 31.60 increased by 5% =
32. 32.100 increased by 15% =
33. 33.450 increased by 10% =
34. 34.280 increased by 25% =
35. 35.616 increased by 75% =
36. 36.230 increased by 30% =
37. 37.290 increased by 40% =
38. 38.340 increased by 10% =
39. 39.70 increased by 30% =
40. 40.340 decreased by 5% =

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