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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 987 · 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 × 0.5 — where does the decimal point go? (a) 0.0495 (b) 0.495 (c) 0.00495 (d) 4.95
  2. 2.0.29 × 5 — where does the decimal point go? (a) 0.145 (b) 0.0145 (c) 1.45 (d) 14.5
  3. 3.3.1 × 4.3 — where does the decimal point go? (a) 0.1333 (b) 1.333 (c) 13.33 (d) 133.3
  4. 4.1.2 × 4 — where does the decimal point go? (a) 48 (b) 4.8 (c) 0.48 (d) 0.048
  5. 5.4.9 × 2 — where does the decimal point go? (a) 98 (b) 9.8 (c) 0.098 (d) 0.98
  6. 6.9.7 × 2.4 — where does the decimal point go? (a) 0.2328 (b) 232.8 (c) 2.328 (d) 23.28
  7. 7.2.3 × 6 — where does the decimal point go? (a) 0.138 (b) 138 (c) 13.8 (d) 1.38
  8. 8.0.42 × 1.7 — where does the decimal point go? (a) 0.00714 (b) 7.14 (c) 0.0714 (d) 0.714
  9. 9.4.8 × 39 — where does the decimal point go? (a) 1.872 (b) 1872 (c) 18.72 (d) 187.2
  10. 10.1.8 × 6 — where does the decimal point go? (a) 10.8 (b) 0.108 (c) 1.08 (d) 108
  11. 11.3.6 × 0.2 — where does the decimal point go? (a) 7.2 (b) 0.0072 (c) 0.72 (d) 0.072
  12. 12.1.8 × 13 — where does the decimal point go? (a) 0.234 (b) 234 (c) 23.4 (d) 2.34
  13. 13.0.42 × 18 — where does the decimal point go? (a) 75.6 (b) 7.56 (c) 0.0756 (d) 0.756
  14. 14.4.3 × 35 — where does the decimal point go? (a) 15.05 (b) 150.5 (c) 1.505 (d) 1505
  15. 15.7.5 × 17 — where does the decimal point go? (a) 127.5 (b) 1.275 (c) 1275 (d) 12.75
  16. 16.9.2 × 0.3 — where does the decimal point go? (a) 27.6 (b) 2.76 (c) 0.276 (d) 0.0276
  17. 17.8.3 × 1.6 — where does the decimal point go? (a) 132.8 (b) 1.328 (c) 13.28 (d) 0.1328
  18. 18.0.41 × 28 — where does the decimal point go? (a) 114.8 (b) 0.1148 (c) 1.148 (d) 11.48
  19. 19.9.6 × 3 — where does the decimal point go? (a) 288 (b) 2.88 (c) 28.8 (d) 0.288
  20. 20.8.5 × 23 — where does the decimal point go? (a) 1.955 (b) 19.55 (c) 195.5 (d) 1955
  21. 21.2.5 × 25 — where does the decimal point go? (a) 62.5 (b) 0.625 (c) 6.25 (d) 625
  22. 22.0.76 × 16 — where does the decimal point go? (a) 1.216 (b) 0.1216 (c) 12.16 (d) 121.6
  23. 23.5.4 × 4.8 — where does the decimal point go? (a) 0.2592 (b) 25.92 (c) 259.2 (d) 2.592
  24. 24.0.87 × 0.6 — where does the decimal point go? (a) 0.522 (b) 0.0522 (c) 5.22 (d) 0.00522
  25. 25.2.4 × 0.2 — where does the decimal point go? (a) 0.48 (b) 0.0048 (c) 4.8 (d) 0.048
  26. 26.9.8 × 4 — where does the decimal point go? (a) 3.92 (b) 0.392 (c) 39.2 (d) 392
  27. 27.3.8 × 7 — where does the decimal point go? (a) 0.266 (b) 26.6 (c) 2.66 (d) 266
  28. 28.4.2 × 8 — where does the decimal point go? (a) 33.6 (b) 336 (c) 0.336 (d) 3.36
  29. 29.2.2 × 0.2 — where does the decimal point go? (a) 4.4 (b) 0.44 (c) 0.044 (d) 0.0044
  30. 30.4.3 × 3.2 — where does the decimal point go? (a) 1.376 (b) 13.76 (c) 0.1376 (d) 137.6
  31. 31.8.4 × 0.3 — where does the decimal point go? (a) 25.2 (b) 2.52 (c) 0.0252 (d) 0.252
  32. 32.9.5 × 37 — where does the decimal point go? (a) 35.15 (b) 3515 (c) 3.515 (d) 351.5
  33. 33.0.58 × 0.3 — where does the decimal point go? (a) 0.0174 (b) 0.174 (c) 0.00174 (d) 1.74
  34. 34.4.4 × 0.4 — where does the decimal point go? (a) 17.6 (b) 1.76 (c) 0.0176 (d) 0.176
  35. 35.0.69 × 0.8 — where does the decimal point go? (a) 0.552 (b) 0.00552 (c) 5.52 (d) 0.0552
  36. 36.0.82 × 0.7 — where does the decimal point go? (a) 0.0574 (b) 0.574 (c) 0.00574 (d) 5.74
  37. 37.9.6 × 29 — where does the decimal point go? (a) 2.784 (b) 2784 (c) 278.4 (d) 27.84
  38. 38.8.1 × 3.1 — where does the decimal point go? (a) 0.2511 (b) 25.11 (c) 2.511 (d) 251.1
  39. 39.7.6 × 0.2 — where does the decimal point go? (a) 0.152 (b) 0.0152 (c) 15.2 (d) 1.52
  40. 40.6.7 × 0.8 — where does the decimal point go? (a) 0.536 (b) 53.6 (c) 5.36 (d) 0.0536

Answer key

  1. 0.495
  2. 1.45
  3. 13.33
  4. 4.8
  5. 9.8
  6. 23.28
  7. 13.8
  8. 0.714
  9. 187.2
  10. 10.8
  11. 0.72
  12. 23.4
  13. 7.56
  14. 150.5
  15. 127.5
  16. 2.76
  17. 13.28
  18. 11.48
  19. 28.8
  20. 195.5
  21. 62.5
  22. 12.16
  23. 25.92
  24. 0.522
  25. 0.48
  26. 39.2
  27. 26.6
  28. 33.6
  29. 0.44
  30. 13.76
  31. 2.52
  32. 351.5
  33. 0.174
  34. 1.76
  35. 0.552
  36. 0.574
  37. 278.4
  38. 25.11
  39. 1.52
  40. 5.36

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