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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 792 · 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. 1.6.4 × 2 — where does the decimal point go? (a) 0.128 (b) 1.28 (c) 128 (d) 12.8
  2. 2.8.7 × 37 — where does the decimal point go? (a) 3.219 (b) 32.19 (c) 321.9 (d) 3219
  3. 3.2.3 × 47 — where does the decimal point go? (a) 108.1 (b) 1081 (c) 10.81 (d) 1.081
  4. 4.0.36 × 0.6 — where does the decimal point go? (a) 0.216 (b) 0.00216 (c) 2.16 (d) 0.0216
  5. 5.0.48 × 31 — where does the decimal point go? (a) 1.488 (b) 0.1488 (c) 14.88 (d) 148.8
  6. 6.0.44 × 18 — where does the decimal point go? (a) 0.0792 (b) 79.2 (c) 0.792 (d) 7.92
  7. 7.2.3 × 14 — where does the decimal point go? (a) 0.322 (b) 32.2 (c) 322 (d) 3.22
  8. 8.3.6 × 2 — where does the decimal point go? (a) 7.2 (b) 0.72 (c) 0.072 (d) 72
  9. 9.4.1 × 7 — where does the decimal point go? (a) 28.7 (b) 287 (c) 0.287 (d) 2.87
  10. 10.2.2 × 3 — where does the decimal point go? (a) 6.6 (b) 66 (c) 0.066 (d) 0.66
  11. 11.8.7 × 7 — where does the decimal point go? (a) 609 (b) 0.609 (c) 6.09 (d) 60.9
  12. 12.5.5 × 0.7 — where does the decimal point go? (a) 3.85 (b) 0.385 (c) 38.5 (d) 0.0385
  13. 13.0.76 × 1.7 — where does the decimal point go? (a) 0.01292 (b) 12.92 (c) 0.1292 (d) 1.292
  14. 14.0.53 × 1.4 — where does the decimal point go? (a) 0.742 (b) 0.00742 (c) 0.0742 (d) 7.42
  15. 15.8.2 × 7 — where does the decimal point go? (a) 57.4 (b) 574 (c) 0.574 (d) 5.74
  16. 16.0.92 × 46 — where does the decimal point go? (a) 42.32 (b) 423.2 (c) 4.232 (d) 0.4232
  17. 17.4.8 × 0.2 — where does the decimal point go? (a) 9.6 (b) 0.96 (c) 0.0096 (d) 0.096
  18. 18.9.6 × 4 — where does the decimal point go? (a) 38.4 (b) 3.84 (c) 0.384 (d) 384
  19. 19.9.2 × 2 — where does the decimal point go? (a) 184 (b) 0.184 (c) 18.4 (d) 1.84
  20. 20.0.77 × 0.7 — where does the decimal point go? (a) 0.00539 (b) 0.0539 (c) 0.539 (d) 5.39
  21. 21.0.69 × 9 — where does the decimal point go? (a) 6.21 (b) 0.621 (c) 62.1 (d) 0.0621
  22. 22.0.21 × 5 — where does the decimal point go? (a) 10.5 (b) 0.0105 (c) 0.105 (d) 1.05
  23. 23.0.19 × 42 — where does the decimal point go? (a) 7.98 (b) 0.798 (c) 79.8 (d) 0.0798
  24. 24.8.6 × 3 — where does the decimal point go? (a) 2.58 (b) 258 (c) 25.8 (d) 0.258
  25. 25.8.4 × 37 — where does the decimal point go? (a) 310.8 (b) 3108 (c) 3.108 (d) 31.08
  26. 26.0.46 × 0.4 — where does the decimal point go? (a) 0.00184 (b) 0.0184 (c) 1.84 (d) 0.184
  27. 27.2.6 × 2.7 — where does the decimal point go? (a) 70.2 (b) 0.702 (c) 0.0702 (d) 7.02
  28. 28.0.83 × 12 — where does the decimal point go? (a) 99.6 (b) 9.96 (c) 0.996 (d) 0.0996
  29. 29.0.27 × 0.6 — where does the decimal point go? (a) 0.162 (b) 0.0162 (c) 0.00162 (d) 1.62
  30. 30.0.47 × 12 — where does the decimal point go? (a) 0.564 (b) 5.64 (c) 56.4 (d) 0.0564
  31. 31.6.2 × 16 — where does the decimal point go? (a) 9.92 (b) 99.2 (c) 992 (d) 0.992
  32. 32.8.3 × 0.8 — where does the decimal point go? (a) 0.664 (b) 6.64 (c) 0.0664 (d) 66.4
  33. 33.9.7 × 3.4 — where does the decimal point go? (a) 329.8 (b) 3.298 (c) 32.98 (d) 0.3298
  34. 34.0.48 × 6 — where does the decimal point go? (a) 0.288 (b) 2.88 (c) 28.8 (d) 0.0288
  35. 35.4.3 × 0.5 — where does the decimal point go? (a) 2.15 (b) 0.0215 (c) 0.215 (d) 21.5
  36. 36.2.9 × 0.2 — where does the decimal point go? (a) 0.58 (b) 5.8 (c) 0.0058 (d) 0.058
  37. 37.0.46 × 12 — where does the decimal point go? (a) 0.0552 (b) 55.2 (c) 5.52 (d) 0.552
  38. 38.0.19 × 21 — where does the decimal point go? (a) 0.399 (b) 0.0399 (c) 39.9 (d) 3.99
  39. 39.9.3 × 4.9 — where does the decimal point go? (a) 4.557 (b) 0.4557 (c) 455.7 (d) 45.57
  40. 40.1.3 × 3 — where does the decimal point go? (a) 39 (b) 0.039 (c) 3.9 (d) 0.39

Answer key

  1. 12.8
  2. 321.9
  3. 108.1
  4. 0.216
  5. 14.88
  6. 7.92
  7. 32.2
  8. 7.2
  9. 28.7
  10. 6.6
  11. 60.9
  12. 3.85
  13. 1.292
  14. 0.742
  15. 57.4
  16. 42.32
  17. 0.96
  18. 38.4
  19. 18.4
  20. 0.539
  21. 6.21
  22. 1.05
  23. 7.98
  24. 25.8
  25. 310.8
  26. 0.184
  27. 7.02
  28. 9.96
  29. 0.162
  30. 5.64
  31. 99.2
  32. 6.64
  33. 32.98
  34. 2.88
  35. 2.15
  36. 0.58
  37. 5.52
  38. 3.99
  39. 45.57
  40. 3.9

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