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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 274 · 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. 1.0.99 × 3 — where does the decimal point go? (a) 0.0297 (b) 0.297 (c) 2.97 (d) 29.7
  2. 2.9.5 × 2.3 — where does the decimal point go? (a) 2.185 (b) 0.2185 (c) 21.85 (d) 218.5
  3. 3.0.68 × 0.6 — where does the decimal point go? (a) 0.408 (b) 4.08 (c) 0.0408 (d) 0.00408
  4. 4.7.7 × 6 — where does the decimal point go? (a) 4.62 (b) 46.2 (c) 0.462 (d) 462
  5. 5.3.4 × 41 — where does the decimal point go? (a) 1.394 (b) 13.94 (c) 1394 (d) 139.4
  6. 6.1.6 × 0.8 — where does the decimal point go? (a) 1.28 (b) 0.0128 (c) 0.128 (d) 12.8
  7. 7.0.89 × 49 — where does the decimal point go? (a) 43.61 (b) 0.4361 (c) 4.361 (d) 436.1
  8. 8.0.98 × 44 — where does the decimal point go? (a) 431.2 (b) 43.12 (c) 0.4312 (d) 4.312
  9. 9.0.79 × 3.8 — where does the decimal point go? (a) 0.3002 (b) 3.002 (c) 0.03002 (d) 30.02
  10. 10.0.78 × 0.8 — where does the decimal point go? (a) 0.0624 (b) 6.24 (c) 0.00624 (d) 0.624
  11. 11.3.7 × 48 — where does the decimal point go? (a) 177.6 (b) 17.76 (c) 1.776 (d) 1776
  12. 12.0.61 × 37 — where does the decimal point go? (a) 0.2257 (b) 22.57 (c) 2.257 (d) 225.7
  13. 13.4.1 × 3 — where does the decimal point go? (a) 0.123 (b) 12.3 (c) 123 (d) 1.23
  14. 14.0.46 × 0.4 — where does the decimal point go? (a) 1.84 (b) 0.00184 (c) 0.184 (d) 0.0184
  15. 15.7.5 × 5 — where does the decimal point go? (a) 0.375 (b) 3.75 (c) 37.5 (d) 375
  16. 16.3.7 × 0.6 — where does the decimal point go? (a) 0.0222 (b) 2.22 (c) 0.222 (d) 22.2
  17. 17.3.7 × 6 — where does the decimal point go? (a) 2.22 (b) 22.2 (c) 222 (d) 0.222
  18. 18.0.64 × 2 — where does the decimal point go? (a) 0.0128 (b) 12.8 (c) 0.128 (d) 1.28
  19. 19.4.7 × 1.6 — where does the decimal point go? (a) 0.752 (b) 75.2 (c) 7.52 (d) 0.0752
  20. 20.6.1 × 0.4 — where does the decimal point go? (a) 0.0244 (b) 24.4 (c) 2.44 (d) 0.244
  21. 21.0.78 × 6 — where does the decimal point go? (a) 4.68 (b) 46.8 (c) 0.468 (d) 0.0468
  22. 22.0.38 × 0.4 — where does the decimal point go? (a) 0.00152 (b) 0.0152 (c) 0.152 (d) 1.52
  23. 23.0.55 × 3.9 — where does the decimal point go? (a) 21.45 (b) 2.145 (c) 0.2145 (d) 0.02145
  24. 24.1.7 × 6 — where does the decimal point go? (a) 10.2 (b) 0.102 (c) 102 (d) 1.02
  25. 25.0.58 × 27 — where does the decimal point go? (a) 156.6 (b) 0.1566 (c) 1.566 (d) 15.66
  26. 26.0.28 × 16 — where does the decimal point go? (a) 0.448 (b) 44.8 (c) 4.48 (d) 0.0448
  27. 27.0.44 × 7 — where does the decimal point go? (a) 0.0308 (b) 0.308 (c) 3.08 (d) 30.8
  28. 28.0.99 × 4 — where does the decimal point go? (a) 0.0396 (b) 3.96 (c) 0.396 (d) 39.6
  29. 29.0.37 × 7 — where does the decimal point go? (a) 25.9 (b) 2.59 (c) 0.0259 (d) 0.259
  30. 30.9.9 × 0.5 — where does the decimal point go? (a) 0.0495 (b) 0.495 (c) 4.95 (d) 49.5
  31. 31.7.3 × 18 — where does the decimal point go? (a) 1314 (b) 13.14 (c) 1.314 (d) 131.4
  32. 32.0.69 × 24 — where does the decimal point go? (a) 16.56 (b) 1.656 (c) 0.1656 (d) 165.6
  33. 33.0.71 × 4.1 — where does the decimal point go? (a) 0.02911 (b) 2.911 (c) 29.11 (d) 0.2911
  34. 34.0.17 × 4.3 — where does the decimal point go? (a) 7.31 (b) 0.731 (c) 0.00731 (d) 0.0731
  35. 35.9.9 × 42 — where does the decimal point go? (a) 415.8 (b) 41.58 (c) 4158 (d) 4.158
  36. 36.0.43 × 0.6 — where does the decimal point go? (a) 0.00258 (b) 0.258 (c) 0.0258 (d) 2.58
  37. 37.4.9 × 0.8 — where does the decimal point go? (a) 0.392 (b) 39.2 (c) 3.92 (d) 0.0392
  38. 38.5.6 × 7 — where does the decimal point go? (a) 392 (b) 3.92 (c) 0.392 (d) 39.2
  39. 39.0.12 × 8 — where does the decimal point go? (a) 9.6 (b) 0.096 (c) 0.96 (d) 0.0096
  40. 40.9.3 × 3 — where does the decimal point go? (a) 27.9 (b) 2.79 (c) 279 (d) 0.279

Answer key

  1. 2.97
  2. 21.85
  3. 0.408
  4. 46.2
  5. 139.4
  6. 1.28
  7. 43.61
  8. 43.12
  9. 3.002
  10. 0.624
  11. 177.6
  12. 22.57
  13. 12.3
  14. 0.184
  15. 37.5
  16. 2.22
  17. 22.2
  18. 1.28
  19. 7.52
  20. 2.44
  21. 4.68
  22. 0.152
  23. 2.145
  24. 10.2
  25. 15.66
  26. 4.48
  27. 3.08
  28. 3.96
  29. 2.59
  30. 4.95
  31. 131.4
  32. 16.56
  33. 2.911
  34. 0.731
  35. 415.8
  36. 0.258
  37. 3.92
  38. 39.2
  39. 0.96
  40. 27.9

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