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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 330 · 40 questions
TalentJR

The trick (Chain the factors): Split the multiplier into two small factors: 12 = 3 × 4, 14 = 2 × 7, 15 = 3 × 5, 16 = 4 × 4, 18 = 2 × 9, 24 = 4 × 6. Multiply by the first factor. Multiply that answer by the second factor (× 4 is double, double).

NameDateTime takenScore ___ / 40
  1. 1.23 × 12 =
  2. 2.39 × 24 =
  3. 3.44 × 16 =
  4. 4.47 × 12 =
  5. 5.22 × 12 =
  6. 6.13 × 15 =
  7. 7.29 × 12 =
  8. 8.15 × 24 =
  9. 9.13 × 14 =
  10. 10.17 × 14 =
  11. 11.16 × 14 =
  12. 12.37 × 15 =
  13. 13.20 × 24 =
  14. 14.15 × 12 =
  15. 15.21 × 12 =
  16. 16.14 × 14 =
  17. 17.19 × 24 =
  18. 18.15 × 15 =
  19. 19.41 × 14 =
  20. 20.11 × 12 =
  21. 21.17 × 12 =
  22. 22.42 × 14 =
  23. 23.45 × 14 =
  24. 24.25 × 12 =
  25. 25.28 × 24 =
  26. 26.40 × 14 =
  27. 27.26 × 18 =
  28. 28.33 × 15 =
  29. 29.26 × 12 =
  30. 30.11 × 15 =
  31. 31.48 × 18 =
  32. 32.37 × 14 =
  33. 33.18 × 12 =
  34. 34.24 × 14 =
  35. 35.33 × 16 =
  36. 36.15 × 16 =
  37. 37.24 × 24 =
  38. 38.15 × 14 =
  39. 39.29 × 14 =
  40. 40.34 × 16 =

Answer key

  1. 276
  2. 936
  3. 704
  4. 564
  5. 264
  6. 195
  7. 348
  8. 360
  9. 182
  10. 238
  11. 224
  12. 555
  13. 480
  14. 180
  15. 252
  16. 196
  17. 456
  18. 225
  19. 574
  20. 132
  21. 204
  22. 588
  23. 630
  24. 300
  25. 672
  26. 560
  27. 468
  28. 495
  29. 312
  30. 165
  31. 864
  32. 518
  33. 216
  34. 336
  35. 528
  36. 240
  37. 576
  38. 210
  39. 406
  40. 544

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