Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 20 · 40 questions

The trick (Count the places): Forget the points and multiply the whole numbers. Count all the digits after the points in the question. Put the point that many places from the right, then check by rounding.

1. 1.9.7 × 39 — where does the decimal point go? (a) 3.783 (b) 378.3 (c) 37.83 (d) 3783
2. 2.0.97 × 4.1 — where does the decimal point go? (a) 0.03977 (b) 0.3977 (c) 3.977 (d) 39.77
3. 3.0.67 × 1.7 — where does the decimal point go? (a) 1.139 (b) 0.1139 (c) 0.01139 (d) 11.39
4. 4.0.34 × 6 — where does the decimal point go? (a) 0.0204 (b) 20.4 (c) 0.204 (d) 2.04
5. 5.4.5 × 0.9 — where does the decimal point go? (a) 4.05 (b) 0.405 (c) 0.0405 (d) 40.5
6. 6.2.7 × 3 — where does the decimal point go? (a) 81 (b) 0.081 (c) 0.81 (d) 8.1
7. 7.2.4 × 3.3 — where does the decimal point go? (a) 7.92 (b) 0.792 (c) 79.2 (d) 0.0792
8. 8.0.93 × 3 — where does the decimal point go? (a) 2.79 (b) 0.0279 (c) 0.279 (d) 27.9
9. 9.1.6 × 22 — where does the decimal point go? (a) 352 (b) 3.52 (c) 0.352 (d) 35.2
10. 10.0.29 × 3 — where does the decimal point go? (a) 0.87 (b) 0.0087 (c) 0.087 (d) 8.7
11. 11.0.13 × 9 — where does the decimal point go? (a) 1.17 (b) 0.0117 (c) 0.117 (d) 11.7
12. 12.0.35 × 7 — where does the decimal point go? (a) 2.45 (b) 0.245 (c) 0.0245 (d) 24.5
13. 13.0.81 × 0.9 — where does the decimal point go? (a) 0.00729 (b) 0.729 (c) 7.29 (d) 0.0729
14. 14.0.77 × 49 — where does the decimal point go? (a) 3.773 (b) 37.73 (c) 0.3773 (d) 377.3
15. 15.1.7 × 11 — where does the decimal point go? (a) 187 (b) 0.187 (c) 18.7 (d) 1.87
16. 16.0.21 × 0.2 — where does the decimal point go? (a) 0.00042 (b) 0.0042 (c) 0.42 (d) 0.042
17. 17.1.4 × 0.7 — where does the decimal point go? (a) 0.0098 (b) 9.8 (c) 0.098 (d) 0.98
18. 18.0.24 × 8 — where does the decimal point go? (a) 19.2 (b) 0.192 (c) 0.0192 (d) 1.92
19. 19.1.5 × 2.1 — where does the decimal point go? (a) 31.5 (b) 0.315 (c) 3.15 (d) 0.0315
20. 20.0.33 × 0.5 — where does the decimal point go? (a) 1.65 (b) 0.165 (c) 0.0165 (d) 0.00165
21. 21.0.24 × 3 — where does the decimal point go? (a) 0.072 (b) 7.2 (c) 0.0072 (d) 0.72
22. 22.0.17 × 39 — where does the decimal point go? (a) 6.63 (b) 0.0663 (c) 66.3 (d) 0.663
23. 23.0.34 × 0.4 — where does the decimal point go? (a) 1.36 (b) 0.00136 (c) 0.0136 (d) 0.136
24. 24.6.7 × 17 — where does the decimal point go? (a) 1139 (b) 113.9 (c) 11.39 (d) 1.139
25. 25.5.3 × 0.6 — where does the decimal point go? (a) 31.8 (b) 3.18 (c) 0.318 (d) 0.0318
26. 26.0.39 × 4.9 — where does the decimal point go? (a) 0.01911 (b) 19.11 (c) 1.911 (d) 0.1911
27. 27.7.1 × 9 — where does the decimal point go? (a) 0.639 (b) 63.9 (c) 6.39 (d) 639
28. 28.5.7 × 5 — where does the decimal point go? (a) 285 (b) 2.85 (c) 28.5 (d) 0.285
29. 29.1.3 × 0.2 — where does the decimal point go? (a) 0.0026 (b) 0.026 (c) 2.6 (d) 0.26
30. 30.0.17 × 18 — where does the decimal point go? (a) 30.6 (b) 3.06 (c) 0.0306 (d) 0.306
31. 31.7.6 × 29 — where does the decimal point go? (a) 2.204 (b) 2204 (c) 220.4 (d) 22.04
32. 32.1.8 × 14 — where does the decimal point go? (a) 25.2 (b) 2.52 (c) 0.252 (d) 252
33. 33.0.59 × 0.6 — where does the decimal point go? (a) 0.354 (b) 0.0354 (c) 3.54 (d) 0.00354
34. 34.3.6 × 0.8 — where does the decimal point go? (a) 28.8 (b) 0.288 (c) 2.88 (d) 0.0288
35. 35.0.71 × 17 — where does the decimal point go? (a) 0.1207 (b) 120.7 (c) 12.07 (d) 1.207
36. 36.5.2 × 3 — where does the decimal point go? (a) 15.6 (b) 156 (c) 1.56 (d) 0.156
37. 37.0.69 × 12 — where does the decimal point go? (a) 0.0828 (b) 8.28 (c) 82.8 (d) 0.828
38. 38.7.3 × 8 — where does the decimal point go? (a) 5.84 (b) 58.4 (c) 0.584 (d) 584
39. 39.7.3 × 4.3 — where does the decimal point go? (a) 3.139 (b) 31.39 (c) 0.3139 (d) 313.9
40. 40.1.8 × 0.9 — where does the decimal point go? (a) 0.162 (b) 0.0162 (c) 1.62 (d) 16.2

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