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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 648 · 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. 1.0.91 × 2.9 — where does the decimal point go? (a) 2.639 (b) 0.2639 (c) 0.02639 (d) 26.39
  2. 2.5.7 × 7 — where does the decimal point go? (a) 39.9 (b) 0.399 (c) 399 (d) 3.99
  3. 3.0.82 × 6 — where does the decimal point go? (a) 49.2 (b) 4.92 (c) 0.492 (d) 0.0492
  4. 4.0.57 × 2.7 — where does the decimal point go? (a) 1.539 (b) 0.01539 (c) 0.1539 (d) 15.39
  5. 5.0.28 × 9 — where does the decimal point go? (a) 0.252 (b) 25.2 (c) 2.52 (d) 0.0252
  6. 6.3.9 × 14 — where does the decimal point go? (a) 5.46 (b) 0.546 (c) 546 (d) 54.6
  7. 7.1.5 × 31 — where does the decimal point go? (a) 46.5 (b) 0.465 (c) 4.65 (d) 465
  8. 8.2.4 × 7 — where does the decimal point go? (a) 1.68 (b) 16.8 (c) 168 (d) 0.168
  9. 9.0.23 × 9 — where does the decimal point go? (a) 0.207 (b) 20.7 (c) 0.0207 (d) 2.07
  10. 10.6.2 × 1.4 — where does the decimal point go? (a) 8.68 (b) 86.8 (c) 0.868 (d) 0.0868
  11. 11.4.7 × 18 — where does the decimal point go? (a) 84.6 (b) 0.846 (c) 8.46 (d) 846
  12. 12.0.73 × 17 — where does the decimal point go? (a) 12.41 (b) 1.241 (c) 0.1241 (d) 124.1
  13. 13.7.8 × 0.8 — where does the decimal point go? (a) 6.24 (b) 0.624 (c) 0.0624 (d) 62.4
  14. 14.0.45 × 31 — where does the decimal point go? (a) 13.95 (b) 1.395 (c) 0.1395 (d) 139.5
  15. 15.0.72 × 4 — where does the decimal point go? (a) 28.8 (b) 0.0288 (c) 0.288 (d) 2.88
  16. 16.5.3 × 6 — where does the decimal point go? (a) 3.18 (b) 318 (c) 31.8 (d) 0.318
  17. 17.3.4 × 0.9 — where does the decimal point go? (a) 30.6 (b) 3.06 (c) 0.306 (d) 0.0306
  18. 18.0.63 × 3 — where does the decimal point go? (a) 0.189 (b) 0.0189 (c) 1.89 (d) 18.9
  19. 19.0.79 × 22 — where does the decimal point go? (a) 17.38 (b) 0.1738 (c) 173.8 (d) 1.738
  20. 20.0.58 × 4 — where does the decimal point go? (a) 23.2 (b) 0.0232 (c) 0.232 (d) 2.32
  21. 21.0.62 × 0.4 — where does the decimal point go? (a) 0.0248 (b) 0.248 (c) 2.48 (d) 0.00248
  22. 22.7.7 × 3 — where does the decimal point go? (a) 2.31 (b) 23.1 (c) 0.231 (d) 231
  23. 23.0.65 × 3.1 — where does the decimal point go? (a) 2.015 (b) 0.02015 (c) 20.15 (d) 0.2015
  24. 24.2.2 × 17 — where does the decimal point go? (a) 0.374 (b) 3.74 (c) 374 (d) 37.4
  25. 25.0.47 × 0.6 — where does the decimal point go? (a) 2.82 (b) 0.0282 (c) 0.00282 (d) 0.282
  26. 26.8.9 × 0.7 — where does the decimal point go? (a) 0.623 (b) 62.3 (c) 6.23 (d) 0.0623
  27. 27.0.27 × 25 — where does the decimal point go? (a) 0.0675 (b) 0.675 (c) 67.5 (d) 6.75
  28. 28.0.23 × 4 — where does the decimal point go? (a) 9.2 (b) 0.092 (c) 0.92 (d) 0.0092
  29. 29.0.51 × 3.2 — where does the decimal point go? (a) 0.01632 (b) 0.1632 (c) 16.32 (d) 1.632
  30. 30.0.76 × 0.4 — where does the decimal point go? (a) 0.0304 (b) 0.304 (c) 3.04 (d) 0.00304
  31. 31.1.4 × 6 — where does the decimal point go? (a) 0.84 (b) 84 (c) 0.084 (d) 8.4
  32. 32.5.8 × 0.3 — where does the decimal point go? (a) 17.4 (b) 1.74 (c) 0.174 (d) 0.0174
  33. 33.8.9 × 4.2 — where does the decimal point go? (a) 3.738 (b) 37.38 (c) 0.3738 (d) 373.8
  34. 34.8.7 × 6 — where does the decimal point go? (a) 52.2 (b) 5.22 (c) 522 (d) 0.522
  35. 35.7.4 × 0.3 — where does the decimal point go? (a) 0.0222 (b) 0.222 (c) 22.2 (d) 2.22
  36. 36.0.31 × 0.6 — where does the decimal point go? (a) 1.86 (b) 0.00186 (c) 0.186 (d) 0.0186
  37. 37.3.8 × 3.4 — where does the decimal point go? (a) 12.92 (b) 129.2 (c) 1.292 (d) 0.1292
  38. 38.0.43 × 0.5 — where does the decimal point go? (a) 0.0215 (b) 0.00215 (c) 2.15 (d) 0.215
  39. 39.0.82 × 36 — where does the decimal point go? (a) 29.52 (b) 0.2952 (c) 295.2 (d) 2.952
  40. 40.0.27 × 49 — where does the decimal point go? (a) 0.1323 (b) 1.323 (c) 13.23 (d) 132.3

Answer key

  1. 2.639
  2. 39.9
  3. 4.92
  4. 1.539
  5. 2.52
  6. 54.6
  7. 46.5
  8. 16.8
  9. 2.07
  10. 8.68
  11. 84.6
  12. 12.41
  13. 6.24
  14. 13.95
  15. 2.88
  16. 31.8
  17. 3.06
  18. 1.89
  19. 17.38
  20. 2.32
  21. 0.248
  22. 23.1
  23. 2.015
  24. 37.4
  25. 0.282
  26. 6.23
  27. 6.75
  28. 0.92
  29. 1.632
  30. 0.304
  31. 8.4
  32. 1.74
  33. 37.38
  34. 52.2
  35. 2.22
  36. 0.186
  37. 12.92
  38. 0.215
  39. 29.52
  40. 13.23

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