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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 429 · 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. 1.4.9 × 49 — where does the decimal point go? (a) 2.401 (b) 2401 (c) 24.01 (d) 240.1
  2. 2.7.9 × 3.6 — where does the decimal point go? (a) 284.4 (b) 28.44 (c) 0.2844 (d) 2.844
  3. 3.6.1 × 6 — where does the decimal point go? (a) 366 (b) 36.6 (c) 0.366 (d) 3.66
  4. 4.5.4 × 21 — where does the decimal point go? (a) 1134 (b) 1.134 (c) 113.4 (d) 11.34
  5. 5.4.5 × 0.9 — where does the decimal point go? (a) 4.05 (b) 40.5 (c) 0.405 (d) 0.0405
  6. 6.1.8 × 3.4 — where does the decimal point go? (a) 61.2 (b) 0.612 (c) 6.12 (d) 0.0612
  7. 7.5.1 × 0.2 — where does the decimal point go? (a) 0.102 (b) 1.02 (c) 0.0102 (d) 10.2
  8. 8.5.1 × 7 — where does the decimal point go? (a) 35.7 (b) 3.57 (c) 0.357 (d) 357
  9. 9.0.21 × 0.9 — where does the decimal point go? (a) 0.0189 (b) 1.89 (c) 0.189 (d) 0.00189
  10. 10.0.89 × 14 — where does the decimal point go? (a) 0.1246 (b) 124.6 (c) 1.246 (d) 12.46
  11. 11.7.7 × 0.9 — where does the decimal point go? (a) 0.693 (b) 6.93 (c) 69.3 (d) 0.0693
  12. 12.0.43 × 4 — where does the decimal point go? (a) 0.0172 (b) 0.172 (c) 17.2 (d) 1.72
  13. 13.6.8 × 21 — where does the decimal point go? (a) 1428 (b) 142.8 (c) 1.428 (d) 14.28
  14. 14.0.48 × 42 — where does the decimal point go? (a) 2.016 (b) 20.16 (c) 201.6 (d) 0.2016
  15. 15.0.22 × 16 — where does the decimal point go? (a) 0.352 (b) 0.0352 (c) 35.2 (d) 3.52
  16. 16.0.56 × 1.9 — where does the decimal point go? (a) 10.64 (b) 0.1064 (c) 0.01064 (d) 1.064
  17. 17.0.92 × 9 — where does the decimal point go? (a) 0.0828 (b) 8.28 (c) 82.8 (d) 0.828
  18. 18.9.8 × 3 — where does the decimal point go? (a) 29.4 (b) 0.294 (c) 294 (d) 2.94
  19. 19.6.9 × 0.4 — where does the decimal point go? (a) 0.0276 (b) 27.6 (c) 2.76 (d) 0.276
  20. 20.0.17 × 0.8 — where does the decimal point go? (a) 0.136 (b) 0.0136 (c) 0.00136 (d) 1.36
  21. 21.0.63 × 3 — where does the decimal point go? (a) 1.89 (b) 0.0189 (c) 18.9 (d) 0.189
  22. 22.4.8 × 29 — where does the decimal point go? (a) 1.392 (b) 1392 (c) 139.2 (d) 13.92
  23. 23.7.2 × 3 — where does the decimal point go? (a) 21.6 (b) 2.16 (c) 216 (d) 0.216
  24. 24.0.76 × 0.7 — where does the decimal point go? (a) 0.0532 (b) 0.00532 (c) 0.532 (d) 5.32
  25. 25.0.94 × 0.7 — where does the decimal point go? (a) 0.00658 (b) 0.0658 (c) 6.58 (d) 0.658
  26. 26.7.7 × 3.5 — where does the decimal point go? (a) 2.695 (b) 26.95 (c) 0.2695 (d) 269.5
  27. 27.2.6 × 24 — where does the decimal point go? (a) 0.624 (b) 62.4 (c) 624 (d) 6.24
  28. 28.1.4 × 13 — where does the decimal point go? (a) 18.2 (b) 1.82 (c) 182 (d) 0.182
  29. 29.4.2 × 0.3 — where does the decimal point go? (a) 0.0126 (b) 0.126 (c) 12.6 (d) 1.26
  30. 30.6.7 × 9 — where does the decimal point go? (a) 603 (b) 60.3 (c) 6.03 (d) 0.603
  31. 31.9.2 × 0.9 — where does the decimal point go? (a) 8.28 (b) 0.0828 (c) 0.828 (d) 82.8
  32. 32.5.9 × 4.8 — where does the decimal point go? (a) 283.2 (b) 2.832 (c) 0.2832 (d) 28.32
  33. 33.8.2 × 4 — where does the decimal point go? (a) 32.8 (b) 3.28 (c) 0.328 (d) 328
  34. 34.0.99 × 0.7 — where does the decimal point go? (a) 0.0693 (b) 0.693 (c) 0.00693 (d) 6.93
  35. 35.6.8 × 7 — where does the decimal point go? (a) 476 (b) 0.476 (c) 4.76 (d) 47.6
  36. 36.0.51 × 9 — where does the decimal point go? (a) 0.0459 (b) 4.59 (c) 0.459 (d) 45.9
  37. 37.9.7 × 16 — where does the decimal point go? (a) 1552 (b) 15.52 (c) 1.552 (d) 155.2
  38. 38.2.4 × 3.8 — where does the decimal point go? (a) 0.912 (b) 91.2 (c) 9.12 (d) 0.0912
  39. 39.7.3 × 6 — where does the decimal point go? (a) 43.8 (b) 0.438 (c) 4.38 (d) 438
  40. 40.0.91 × 15 — where does the decimal point go? (a) 1.365 (b) 136.5 (c) 13.65 (d) 0.1365

Answer key

  1. 240.1
  2. 28.44
  3. 36.6
  4. 113.4
  5. 4.05
  6. 6.12
  7. 1.02
  8. 35.7
  9. 0.189
  10. 12.46
  11. 6.93
  12. 1.72
  13. 142.8
  14. 20.16
  15. 3.52
  16. 1.064
  17. 8.28
  18. 29.4
  19. 2.76
  20. 0.136
  21. 1.89
  22. 139.2
  23. 21.6
  24. 0.532
  25. 0.658
  26. 26.95
  27. 62.4
  28. 18.2
  29. 1.26
  30. 60.3
  31. 8.28
  32. 28.32
  33. 32.8
  34. 0.693
  35. 47.6
  36. 4.59
  37. 155.2
  38. 9.12
  39. 43.8
  40. 13.65

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