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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 176 · 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. 1.0.64 × 2 — where does the decimal point go? (a) 12.8 (b) 0.128 (c) 0.0128 (d) 1.28
  2. 2.7.9 × 43 — where does the decimal point go? (a) 33.97 (b) 3397 (c) 3.397 (d) 339.7
  3. 3.0.36 × 3.8 — where does the decimal point go? (a) 0.01368 (b) 0.1368 (c) 1.368 (d) 13.68
  4. 4.8.9 × 36 — where does the decimal point go? (a) 3.204 (b) 320.4 (c) 32.04 (d) 3204
  5. 5.4.4 × 9 — where does the decimal point go? (a) 396 (b) 0.396 (c) 39.6 (d) 3.96
  6. 6.4.3 × 0.8 — where does the decimal point go? (a) 34.4 (b) 3.44 (c) 0.0344 (d) 0.344
  7. 7.0.56 × 11 — where does the decimal point go? (a) 0.0616 (b) 0.616 (c) 61.6 (d) 6.16
  8. 8.3.2 × 39 — where does the decimal point go? (a) 124.8 (b) 1.248 (c) 1248 (d) 12.48
  9. 9.0.56 × 4 — where does the decimal point go? (a) 0.224 (b) 22.4 (c) 2.24 (d) 0.0224
  10. 10.6.9 × 0.5 — where does the decimal point go? (a) 3.45 (b) 34.5 (c) 0.0345 (d) 0.345
  11. 11.0.62 × 31 — where does the decimal point go? (a) 0.1922 (b) 192.2 (c) 1.922 (d) 19.22
  12. 12.0.77 × 0.5 — where does the decimal point go? (a) 0.385 (b) 0.00385 (c) 3.85 (d) 0.0385
  13. 13.4.9 × 6 — where does the decimal point go? (a) 0.294 (b) 2.94 (c) 294 (d) 29.4
  14. 14.8.2 × 29 — where does the decimal point go? (a) 2378 (b) 237.8 (c) 2.378 (d) 23.78
  15. 15.3.4 × 2.2 — where does the decimal point go? (a) 0.748 (b) 0.0748 (c) 74.8 (d) 7.48
  16. 16.0.13 × 8 — where does the decimal point go? (a) 0.0104 (b) 10.4 (c) 0.104 (d) 1.04
  17. 17.0.31 × 42 — where does the decimal point go? (a) 0.1302 (b) 130.2 (c) 13.02 (d) 1.302
  18. 18.1.6 × 0.9 — where does the decimal point go? (a) 1.44 (b) 0.0144 (c) 0.144 (d) 14.4
  19. 19.4.2 × 9 — where does the decimal point go? (a) 378 (b) 0.378 (c) 3.78 (d) 37.8
  20. 20.6.7 × 21 — where does the decimal point go? (a) 14.07 (b) 1407 (c) 140.7 (d) 1.407
  21. 21.0.97 × 0.6 — where does the decimal point go? (a) 0.0582 (b) 5.82 (c) 0.582 (d) 0.00582
  22. 22.0.91 × 4.9 — where does the decimal point go? (a) 4.459 (b) 44.59 (c) 0.04459 (d) 0.4459
  23. 23.0.23 × 2 — where does the decimal point go? (a) 0.046 (b) 0.0046 (c) 4.6 (d) 0.46
  24. 24.9.3 × 1.6 — where does the decimal point go? (a) 148.8 (b) 0.1488 (c) 1.488 (d) 14.88
  25. 25.5.1 × 3.1 — where does the decimal point go? (a) 1.581 (b) 15.81 (c) 158.1 (d) 0.1581
  26. 26.4.4 × 0.6 — where does the decimal point go? (a) 26.4 (b) 0.264 (c) 0.0264 (d) 2.64
  27. 27.9.7 × 16 — where does the decimal point go? (a) 1.552 (b) 15.52 (c) 1552 (d) 155.2
  28. 28.6.3 × 6 — where does the decimal point go? (a) 378 (b) 3.78 (c) 37.8 (d) 0.378
  29. 29.9.1 × 8 — where does the decimal point go? (a) 728 (b) 72.8 (c) 7.28 (d) 0.728
  30. 30.4.4 × 4.7 — where does the decimal point go? (a) 2.068 (b) 20.68 (c) 0.2068 (d) 206.8
  31. 31.6.4 × 2 — where does the decimal point go? (a) 0.128 (b) 1.28 (c) 128 (d) 12.8
  32. 32.8.6 × 1.9 — where does the decimal point go? (a) 0.1634 (b) 1.634 (c) 16.34 (d) 163.4
  33. 33.8.7 × 6 — where does the decimal point go? (a) 0.522 (b) 52.2 (c) 522 (d) 5.22
  34. 34.7.4 × 44 — where does the decimal point go? (a) 3.256 (b) 3256 (c) 32.56 (d) 325.6
  35. 35.0.14 × 2 — where does the decimal point go? (a) 0.028 (b) 0.0028 (c) 0.28 (d) 2.8
  36. 36.0.44 × 33 — where does the decimal point go? (a) 145.2 (b) 14.52 (c) 1.452 (d) 0.1452
  37. 37.9.3 × 0.2 — where does the decimal point go? (a) 0.186 (b) 1.86 (c) 0.0186 (d) 18.6
  38. 38.9.4 × 17 — where does the decimal point go? (a) 1.598 (b) 1598 (c) 159.8 (d) 15.98
  39. 39.0.78 × 0.3 — where does the decimal point go? (a) 0.0234 (b) 0.00234 (c) 0.234 (d) 2.34
  40. 40.0.49 × 1.9 — where does the decimal point go? (a) 0.00931 (b) 0.0931 (c) 0.931 (d) 9.31

Answer key

  1. 1.28
  2. 339.7
  3. 1.368
  4. 320.4
  5. 39.6
  6. 3.44
  7. 6.16
  8. 124.8
  9. 2.24
  10. 3.45
  11. 19.22
  12. 0.385
  13. 29.4
  14. 237.8
  15. 7.48
  16. 1.04
  17. 13.02
  18. 1.44
  19. 37.8
  20. 140.7
  21. 0.582
  22. 4.459
  23. 0.46
  24. 14.88
  25. 15.81
  26. 2.64
  27. 155.2
  28. 37.8
  29. 72.8
  30. 20.68
  31. 12.8
  32. 16.34
  33. 52.2
  34. 325.6
  35. 0.28
  36. 14.52
  37. 1.86
  38. 159.8
  39. 0.234
  40. 0.931

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