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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 777 · 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. 1.5.3 × 1.3 — where does the decimal point go? (a) 68.9 (b) 0.0689 (c) 6.89 (d) 0.689
  2. 2.0.36 × 38 — where does the decimal point go? (a) 136.8 (b) 13.68 (c) 0.1368 (d) 1.368
  3. 3.2.2 × 1.7 — where does the decimal point go? (a) 0.374 (b) 3.74 (c) 37.4 (d) 0.0374
  4. 4.8.3 × 6 — where does the decimal point go? (a) 49.8 (b) 0.498 (c) 4.98 (d) 498
  5. 5.7.8 × 26 — where does the decimal point go? (a) 202.8 (b) 2028 (c) 2.028 (d) 20.28
  6. 6.0.83 × 2.4 — where does the decimal point go? (a) 1.992 (b) 0.1992 (c) 0.01992 (d) 19.92
  7. 7.0.67 × 4.3 — where does the decimal point go? (a) 28.81 (b) 0.2881 (c) 0.02881 (d) 2.881
  8. 8.0.14 × 2 — where does the decimal point go? (a) 0.028 (b) 0.28 (c) 0.0028 (d) 2.8
  9. 9.1.9 × 21 — where does the decimal point go? (a) 0.399 (b) 39.9 (c) 399 (d) 3.99
  10. 10.7.1 × 4 — where does the decimal point go? (a) 0.284 (b) 2.84 (c) 28.4 (d) 284
  11. 11.0.83 × 0.7 — where does the decimal point go? (a) 0.581 (b) 5.81 (c) 0.00581 (d) 0.0581
  12. 12.2.7 × 11 — where does the decimal point go? (a) 29.7 (b) 0.297 (c) 297 (d) 2.97
  13. 13.9.8 × 4 — where does the decimal point go? (a) 0.392 (b) 392 (c) 39.2 (d) 3.92
  14. 14.4.6 × 4.6 — where does the decimal point go? (a) 211.6 (b) 0.2116 (c) 21.16 (d) 2.116
  15. 15.1.4 × 2.6 — where does the decimal point go? (a) 0.0364 (b) 36.4 (c) 0.364 (d) 3.64
  16. 16.0.12 × 3.3 — where does the decimal point go? (a) 0.396 (b) 0.0396 (c) 0.00396 (d) 3.96
  17. 17.6.3 × 2 — where does the decimal point go? (a) 1.26 (b) 0.126 (c) 126 (d) 12.6
  18. 18.0.57 × 8 — where does the decimal point go? (a) 4.56 (b) 0.0456 (c) 0.456 (d) 45.6
  19. 19.5.6 × 4.9 — where does the decimal point go? (a) 27.44 (b) 2.744 (c) 0.2744 (d) 274.4
  20. 20.1.4 × 2 — where does the decimal point go? (a) 0.28 (b) 2.8 (c) 0.028 (d) 28
  21. 21.8.4 × 24 — where does the decimal point go? (a) 201.6 (b) 2.016 (c) 2016 (d) 20.16
  22. 22.8.8 × 27 — where does the decimal point go? (a) 23.76 (b) 2.376 (c) 237.6 (d) 2376
  23. 23.0.73 × 2 — where does the decimal point go? (a) 0.146 (b) 14.6 (c) 0.0146 (d) 1.46
  24. 24.1.4 × 2.7 — where does the decimal point go? (a) 0.0378 (b) 3.78 (c) 37.8 (d) 0.378
  25. 25.0.57 × 0.7 — where does the decimal point go? (a) 0.0399 (b) 0.00399 (c) 3.99 (d) 0.399
  26. 26.9.8 × 1.4 — where does the decimal point go? (a) 137.2 (b) 0.1372 (c) 13.72 (d) 1.372
  27. 27.8.2 × 9 — where does the decimal point go? (a) 0.738 (b) 73.8 (c) 7.38 (d) 738
  28. 28.2.1 × 0.9 — where does the decimal point go? (a) 1.89 (b) 18.9 (c) 0.0189 (d) 0.189
  29. 29.8.3 × 13 — where does the decimal point go? (a) 107.9 (b) 1.079 (c) 1079 (d) 10.79
  30. 30.0.33 × 11 — where does the decimal point go? (a) 36.3 (b) 0.0363 (c) 0.363 (d) 3.63
  31. 31.0.21 × 16 — where does the decimal point go? (a) 0.336 (b) 3.36 (c) 33.6 (d) 0.0336
  32. 32.0.89 × 35 — where does the decimal point go? (a) 0.3115 (b) 3.115 (c) 31.15 (d) 311.5
  33. 33.2.7 × 6 — where does the decimal point go? (a) 0.162 (b) 162 (c) 1.62 (d) 16.2
  34. 34.0.31 × 33 — where does the decimal point go? (a) 0.1023 (b) 1.023 (c) 10.23 (d) 102.3
  35. 35.3.9 × 22 — where does the decimal point go? (a) 85.8 (b) 8.58 (c) 858 (d) 0.858
  36. 36.0.59 × 27 — where does the decimal point go? (a) 15.93 (b) 1.593 (c) 0.1593 (d) 159.3
  37. 37.4.7 × 4 — where does the decimal point go? (a) 188 (b) 1.88 (c) 0.188 (d) 18.8
  38. 38.8.2 × 43 — where does the decimal point go? (a) 35.26 (b) 3.526 (c) 352.6 (d) 3526
  39. 39.6.5 × 0.7 — where does the decimal point go? (a) 45.5 (b) 4.55 (c) 0.0455 (d) 0.455
  40. 40.0.93 × 2.4 — where does the decimal point go? (a) 0.02232 (b) 0.2232 (c) 22.32 (d) 2.232

Answer key

  1. 6.89
  2. 13.68
  3. 3.74
  4. 49.8
  5. 202.8
  6. 1.992
  7. 2.881
  8. 0.28
  9. 39.9
  10. 28.4
  11. 0.581
  12. 29.7
  13. 39.2
  14. 21.16
  15. 3.64
  16. 0.396
  17. 12.6
  18. 4.56
  19. 27.44
  20. 2.8
  21. 201.6
  22. 237.6
  23. 1.46
  24. 3.78
  25. 0.399
  26. 13.72
  27. 73.8
  28. 1.89
  29. 107.9
  30. 3.63
  31. 3.36
  32. 31.15
  33. 16.2
  34. 10.23
  35. 85.8
  36. 15.93
  37. 18.8
  38. 352.6
  39. 4.55
  40. 2.232

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