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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 573 · 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. 1.2.2 × 0.3 — where does the decimal point go? (a) 0.066 (b) 0.66 (c) 0.0066 (d) 6.6
  2. 2.5.4 × 2.3 — where does the decimal point go? (a) 124.2 (b) 12.42 (c) 1.242 (d) 0.1242
  3. 3.9.2 × 3.1 — where does the decimal point go? (a) 2.852 (b) 285.2 (c) 0.2852 (d) 28.52
  4. 4.9.7 × 0.6 — where does the decimal point go? (a) 0.582 (b) 58.2 (c) 5.82 (d) 0.0582
  5. 5.0.46 × 28 — where does the decimal point go? (a) 1.288 (b) 0.1288 (c) 128.8 (d) 12.88
  6. 6.0.42 × 27 — where does the decimal point go? (a) 113.4 (b) 1.134 (c) 0.1134 (d) 11.34
  7. 7.0.18 × 9 — where does the decimal point go? (a) 0.162 (b) 16.2 (c) 0.0162 (d) 1.62
  8. 8.3.8 × 0.7 — where does the decimal point go? (a) 0.266 (b) 0.0266 (c) 26.6 (d) 2.66
  9. 9.8.7 × 2 — where does the decimal point go? (a) 1.74 (b) 0.174 (c) 174 (d) 17.4
  10. 10.1.5 × 9 — where does the decimal point go? (a) 13.5 (b) 135 (c) 1.35 (d) 0.135
  11. 11.7.8 × 2 — where does the decimal point go? (a) 1.56 (b) 15.6 (c) 0.156 (d) 156
  12. 12.3.9 × 9 — where does the decimal point go? (a) 35.1 (b) 0.351 (c) 3.51 (d) 351
  13. 13.7.4 × 2 — where does the decimal point go? (a) 14.8 (b) 1.48 (c) 0.148 (d) 148
  14. 14.0.42 × 4.9 — where does the decimal point go? (a) 2.058 (b) 0.2058 (c) 0.02058 (d) 20.58
  15. 15.9.1 × 8 — where does the decimal point go? (a) 72.8 (b) 728 (c) 0.728 (d) 7.28
  16. 16.0.46 × 6 — where does the decimal point go? (a) 0.276 (b) 0.0276 (c) 27.6 (d) 2.76
  17. 17.1.7 × 0.8 — where does the decimal point go? (a) 0.136 (b) 13.6 (c) 0.0136 (d) 1.36
  18. 18.4.8 × 8 — where does the decimal point go? (a) 3.84 (b) 38.4 (c) 0.384 (d) 384
  19. 19.0.18 × 23 — where does the decimal point go? (a) 4.14 (b) 0.414 (c) 0.0414 (d) 41.4
  20. 20.8.9 × 0.4 — where does the decimal point go? (a) 0.356 (b) 3.56 (c) 35.6 (d) 0.0356
  21. 21.0.94 × 4 — where does the decimal point go? (a) 0.376 (b) 37.6 (c) 0.0376 (d) 3.76
  22. 22.1.2 × 17 — where does the decimal point go? (a) 2.04 (b) 0.204 (c) 20.4 (d) 204
  23. 23.0.93 × 1.2 — where does the decimal point go? (a) 1.116 (b) 11.16 (c) 0.1116 (d) 0.01116
  24. 24.0.37 × 6 — where does the decimal point go? (a) 2.22 (b) 22.2 (c) 0.0222 (d) 0.222
  25. 25.0.41 × 48 — where does the decimal point go? (a) 19.68 (b) 196.8 (c) 0.1968 (d) 1.968
  26. 26.0.78 × 7 — where does the decimal point go? (a) 0.546 (b) 0.0546 (c) 5.46 (d) 54.6
  27. 27.0.61 × 4 — where does the decimal point go? (a) 0.0244 (b) 2.44 (c) 24.4 (d) 0.244
  28. 28.5.2 × 9 — where does the decimal point go? (a) 468 (b) 46.8 (c) 0.468 (d) 4.68
  29. 29.7.9 × 4.2 — where does the decimal point go? (a) 3.318 (b) 331.8 (c) 33.18 (d) 0.3318
  30. 30.1.6 × 8 — where does the decimal point go? (a) 128 (b) 1.28 (c) 12.8 (d) 0.128
  31. 31.0.44 × 2.6 — where does the decimal point go? (a) 1.144 (b) 0.01144 (c) 11.44 (d) 0.1144
  32. 32.0.49 × 2.5 — where does the decimal point go? (a) 0.1225 (b) 1.225 (c) 0.01225 (d) 12.25
  33. 33.6.4 × 0.6 — where does the decimal point go? (a) 3.84 (b) 38.4 (c) 0.0384 (d) 0.384
  34. 34.0.27 × 7 — where does the decimal point go? (a) 0.0189 (b) 0.189 (c) 18.9 (d) 1.89
  35. 35.2.6 × 2 — where does the decimal point go? (a) 52 (b) 5.2 (c) 0.052 (d) 0.52
  36. 36.0.19 × 4 — where does the decimal point go? (a) 0.076 (b) 0.76 (c) 0.0076 (d) 7.6
  37. 37.3.2 × 4 — where does the decimal point go? (a) 1.28 (b) 12.8 (c) 0.128 (d) 128
  38. 38.0.57 × 7 — where does the decimal point go? (a) 0.0399 (b) 39.9 (c) 0.399 (d) 3.99
  39. 39.0.78 × 0.6 — where does the decimal point go? (a) 0.468 (b) 4.68 (c) 0.0468 (d) 0.00468
  40. 40.3.6 × 0.7 — where does the decimal point go? (a) 2.52 (b) 25.2 (c) 0.0252 (d) 0.252

Answer key

  1. 0.66
  2. 12.42
  3. 28.52
  4. 5.82
  5. 12.88
  6. 11.34
  7. 1.62
  8. 2.66
  9. 17.4
  10. 13.5
  11. 15.6
  12. 35.1
  13. 14.8
  14. 2.058
  15. 72.8
  16. 2.76
  17. 1.36
  18. 38.4
  19. 4.14
  20. 3.56
  21. 3.76
  22. 20.4
  23. 1.116
  24. 2.22
  25. 19.68
  26. 5.46
  27. 2.44
  28. 46.8
  29. 33.18
  30. 12.8
  31. 1.144
  32. 1.225
  33. 3.84
  34. 1.89
  35. 5.2
  36. 0.76
  37. 12.8
  38. 3.99
  39. 0.468
  40. 2.52

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