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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 23 · 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. 1.0.41 × 35 — where does the decimal point go? (a) 1.435 (b) 14.35 (c) 143.5 (d) 0.1435
  2. 2.0.14 × 3.1 — where does the decimal point go? (a) 0.434 (b) 4.34 (c) 0.00434 (d) 0.0434
  3. 3.2.4 × 9 — where does the decimal point go? (a) 216 (b) 2.16 (c) 0.216 (d) 21.6
  4. 4.0.41 × 27 — where does the decimal point go? (a) 11.07 (b) 0.1107 (c) 110.7 (d) 1.107
  5. 5.2.9 × 0.2 — where does the decimal point go? (a) 0.58 (b) 0.058 (c) 0.0058 (d) 5.8
  6. 6.0.63 × 2 — where does the decimal point go? (a) 1.26 (b) 0.126 (c) 0.0126 (d) 12.6
  7. 7.2.3 × 0.6 — where does the decimal point go? (a) 0.138 (b) 1.38 (c) 13.8 (d) 0.0138
  8. 8.0.43 × 7 — where does the decimal point go? (a) 0.0301 (b) 3.01 (c) 30.1 (d) 0.301
  9. 9.6.7 × 0.3 — where does the decimal point go? (a) 2.01 (b) 0.0201 (c) 0.201 (d) 20.1
  10. 10.0.99 × 2 — where does the decimal point go? (a) 0.198 (b) 0.0198 (c) 19.8 (d) 1.98
  11. 11.6.4 × 0.2 — where does the decimal point go? (a) 12.8 (b) 1.28 (c) 0.0128 (d) 0.128
  12. 12.5.3 × 3 — where does the decimal point go? (a) 0.159 (b) 159 (c) 15.9 (d) 1.59
  13. 13.0.74 × 33 — where does the decimal point go? (a) 24.42 (b) 0.2442 (c) 244.2 (d) 2.442
  14. 14.0.43 × 0.5 — where does the decimal point go? (a) 0.0215 (b) 0.00215 (c) 0.215 (d) 2.15
  15. 15.0.16 × 44 — where does the decimal point go? (a) 7.04 (b) 0.704 (c) 0.0704 (d) 70.4
  16. 16.5.3 × 3.7 — where does the decimal point go? (a) 1.961 (b) 0.1961 (c) 19.61 (d) 196.1
  17. 17.0.71 × 33 — where does the decimal point go? (a) 2.343 (b) 23.43 (c) 234.3 (d) 0.2343
  18. 18.0.19 × 0.5 — where does the decimal point go? (a) 0.95 (b) 0.0095 (c) 0.00095 (d) 0.095
  19. 19.9.1 × 0.5 — where does the decimal point go? (a) 4.55 (b) 0.0455 (c) 0.455 (d) 45.5
  20. 20.9.3 × 7 — where does the decimal point go? (a) 6.51 (b) 0.651 (c) 651 (d) 65.1
  21. 21.0.22 × 9 — where does the decimal point go? (a) 0.0198 (b) 0.198 (c) 1.98 (d) 19.8
  22. 22.4.9 × 0.5 — where does the decimal point go? (a) 0.245 (b) 0.0245 (c) 24.5 (d) 2.45
  23. 23.0.89 × 33 — where does the decimal point go? (a) 0.2937 (b) 2.937 (c) 293.7 (d) 29.37
  24. 24.0.21 × 33 — where does the decimal point go? (a) 6.93 (b) 0.0693 (c) 0.693 (d) 69.3
  25. 25.0.98 × 4 — where does the decimal point go? (a) 39.2 (b) 0.392 (c) 0.0392 (d) 3.92
  26. 26.3.7 × 0.3 — where does the decimal point go? (a) 0.0111 (b) 0.111 (c) 1.11 (d) 11.1
  27. 27.0.54 × 6 — where does the decimal point go? (a) 32.4 (b) 3.24 (c) 0.0324 (d) 0.324
  28. 28.4.6 × 3.9 — where does the decimal point go? (a) 17.94 (b) 0.1794 (c) 1.794 (d) 179.4
  29. 29.0.59 × 6 — where does the decimal point go? (a) 35.4 (b) 0.354 (c) 0.0354 (d) 3.54
  30. 30.4.3 × 3.8 — where does the decimal point go? (a) 163.4 (b) 0.1634 (c) 1.634 (d) 16.34
  31. 31.7.5 × 2.3 — where does the decimal point go? (a) 1.725 (b) 0.1725 (c) 172.5 (d) 17.25
  32. 32.0.27 × 0.7 — where does the decimal point go? (a) 0.0189 (b) 0.00189 (c) 1.89 (d) 0.189
  33. 33.0.68 × 8 — where does the decimal point go? (a) 0.544 (b) 54.4 (c) 5.44 (d) 0.0544
  34. 34.2.7 × 45 — where does the decimal point go? (a) 12.15 (b) 1215 (c) 1.215 (d) 121.5
  35. 35.0.37 × 0.6 — where does the decimal point go? (a) 0.222 (b) 0.00222 (c) 2.22 (d) 0.0222
  36. 36.7.4 × 44 — where does the decimal point go? (a) 3.256 (b) 325.6 (c) 3256 (d) 32.56
  37. 37.0.59 × 8 — where does the decimal point go? (a) 4.72 (b) 0.472 (c) 0.0472 (d) 47.2
  38. 38.9.1 × 4 — where does the decimal point go? (a) 364 (b) 36.4 (c) 3.64 (d) 0.364
  39. 39.4.8 × 7 — where does the decimal point go? (a) 336 (b) 3.36 (c) 33.6 (d) 0.336
  40. 40.0.78 × 4 — where does the decimal point go? (a) 0.0312 (b) 0.312 (c) 31.2 (d) 3.12

Answer key

  1. 14.35
  2. 0.434
  3. 21.6
  4. 11.07
  5. 0.58
  6. 1.26
  7. 1.38
  8. 3.01
  9. 2.01
  10. 1.98
  11. 1.28
  12. 15.9
  13. 24.42
  14. 0.215
  15. 7.04
  16. 19.61
  17. 23.43
  18. 0.095
  19. 4.55
  20. 65.1
  21. 1.98
  22. 2.45
  23. 29.37
  24. 6.93
  25. 3.92
  26. 1.11
  27. 3.24
  28. 17.94
  29. 3.54
  30. 16.34
  31. 17.25
  32. 0.189
  33. 5.44
  34. 121.5
  35. 0.222
  36. 325.6
  37. 4.72
  38. 36.4
  39. 33.6
  40. 3.12

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