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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 813 · 40 questions
TalentJR

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.

NameDateTime takenScore ___ / 40
  1. 1.7.7 × 0.8 — where does the decimal point go? (a) 6.16 (b) 0.616 (c) 61.6 (d) 0.0616
  2. 2.9.6 × 7 — where does the decimal point go? (a) 0.672 (b) 672 (c) 67.2 (d) 6.72
  3. 3.3.4 × 33 — where does the decimal point go? (a) 1122 (b) 11.22 (c) 112.2 (d) 1.122
  4. 4.3.5 × 13 — where does the decimal point go? (a) 45.5 (b) 4.55 (c) 0.455 (d) 455
  5. 5.2.2 × 37 — where does the decimal point go? (a) 81.4 (b) 8.14 (c) 0.814 (d) 814
  6. 6.0.34 × 8 — where does the decimal point go? (a) 2.72 (b) 27.2 (c) 0.272 (d) 0.0272
  7. 7.4.3 × 33 — where does the decimal point go? (a) 1419 (b) 1.419 (c) 14.19 (d) 141.9
  8. 8.1.9 × 29 — where does the decimal point go? (a) 0.551 (b) 5.51 (c) 551 (d) 55.1
  9. 9.0.91 × 26 — where does the decimal point go? (a) 236.6 (b) 23.66 (c) 0.2366 (d) 2.366
  10. 10.9.8 × 4.4 — where does the decimal point go? (a) 431.2 (b) 0.4312 (c) 4.312 (d) 43.12
  11. 11.6.3 × 13 — where does the decimal point go? (a) 8.19 (b) 0.819 (c) 81.9 (d) 819
  12. 12.0.68 × 21 — where does the decimal point go? (a) 0.1428 (b) 1.428 (c) 142.8 (d) 14.28
  13. 13.0.29 × 3.9 — where does the decimal point go? (a) 1.131 (b) 11.31 (c) 0.01131 (d) 0.1131
  14. 14.7.6 × 2 — where does the decimal point go? (a) 15.2 (b) 1.52 (c) 152 (d) 0.152
  15. 15.9.1 × 7 — where does the decimal point go? (a) 6.37 (b) 637 (c) 0.637 (d) 63.7
  16. 16.0.13 × 0.5 — where does the decimal point go? (a) 0.065 (b) 0.0065 (c) 0.00065 (d) 0.65
  17. 17.0.17 × 22 — where does the decimal point go? (a) 0.374 (b) 0.0374 (c) 37.4 (d) 3.74
  18. 18.6.8 × 0.3 — where does the decimal point go? (a) 0.204 (b) 2.04 (c) 0.0204 (d) 20.4
  19. 19.2.8 × 17 — where does the decimal point go? (a) 47.6 (b) 4.76 (c) 0.476 (d) 476
  20. 20.0.36 × 47 — where does the decimal point go? (a) 169.2 (b) 0.1692 (c) 16.92 (d) 1.692
  21. 21.0.25 × 5 — where does the decimal point go? (a) 1.25 (b) 0.0125 (c) 12.5 (d) 0.125
  22. 22.7.1 × 49 — where does the decimal point go? (a) 3479 (b) 3.479 (c) 347.9 (d) 34.79
  23. 23.0.14 × 36 — where does the decimal point go? (a) 0.0504 (b) 5.04 (c) 0.504 (d) 50.4
  24. 24.2.4 × 18 — where does the decimal point go? (a) 432 (b) 43.2 (c) 0.432 (d) 4.32
  25. 25.2.1 × 25 — where does the decimal point go? (a) 525 (b) 52.5 (c) 5.25 (d) 0.525
  26. 26.0.59 × 2 — where does the decimal point go? (a) 0.118 (b) 1.18 (c) 11.8 (d) 0.0118
  27. 27.0.89 × 2.8 — where does the decimal point go? (a) 0.2492 (b) 2.492 (c) 24.92 (d) 0.02492
  28. 28.7.4 × 7 — where does the decimal point go? (a) 51.8 (b) 518 (c) 5.18 (d) 0.518
  29. 29.0.15 × 0.7 — where does the decimal point go? (a) 0.00105 (b) 0.105 (c) 1.05 (d) 0.0105
  30. 30.0.27 × 0.8 — where does the decimal point go? (a) 0.216 (b) 0.0216 (c) 0.00216 (d) 2.16
  31. 31.9.8 × 3 — where does the decimal point go? (a) 0.294 (b) 294 (c) 29.4 (d) 2.94
  32. 32.0.79 × 3 — where does the decimal point go? (a) 0.237 (b) 23.7 (c) 2.37 (d) 0.0237
  33. 33.0.28 × 6 — where does the decimal point go? (a) 16.8 (b) 0.168 (c) 1.68 (d) 0.0168
  34. 34.5.9 × 43 — where does the decimal point go? (a) 25.37 (b) 2537 (c) 2.537 (d) 253.7
  35. 35.0.82 × 4 — where does the decimal point go? (a) 32.8 (b) 0.0328 (c) 3.28 (d) 0.328
  36. 36.0.71 × 0.9 — where does the decimal point go? (a) 0.00639 (b) 0.0639 (c) 6.39 (d) 0.639
  37. 37.7.3 × 6 — where does the decimal point go? (a) 4.38 (b) 438 (c) 0.438 (d) 43.8
  38. 38.8.5 × 0.3 — where does the decimal point go? (a) 25.5 (b) 0.0255 (c) 0.255 (d) 2.55
  39. 39.9.7 × 7 — where does the decimal point go? (a) 67.9 (b) 6.79 (c) 0.679 (d) 679
  40. 40.0.57 × 48 — where does the decimal point go? (a) 273.6 (b) 2.736 (c) 27.36 (d) 0.2736

Answer key

  1. 6.16
  2. 67.2
  3. 112.2
  4. 45.5
  5. 81.4
  6. 2.72
  7. 141.9
  8. 55.1
  9. 23.66
  10. 43.12
  11. 81.9
  12. 14.28
  13. 1.131
  14. 15.2
  15. 63.7
  16. 0.065
  17. 3.74
  18. 2.04
  19. 47.6
  20. 16.92
  21. 1.25
  22. 347.9
  23. 5.04
  24. 43.2
  25. 52.5
  26. 1.18
  27. 2.492
  28. 51.8
  29. 0.105
  30. 0.216
  31. 29.4
  32. 2.37
  33. 1.68
  34. 253.7
  35. 3.28
  36. 0.639
  37. 43.8
  38. 2.55
  39. 67.9
  40. 27.36

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