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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 386 · 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. 1.32 × 14 =
  2. 2.27 × 16 =
  3. 3.37 × 24 =
  4. 4.23 × 12 =
  5. 5.35 × 14 =
  6. 6.29 × 12 =
  7. 7.39 × 16 =
  8. 8.45 × 18 =
  9. 9.37 × 16 =
  10. 10.11 × 15 =
  11. 11.30 × 15 =
  12. 12.33 × 14 =
  13. 13.43 × 16 =
  14. 14.42 × 15 =
  15. 15.22 × 14 =
  16. 16.26 × 14 =
  17. 17.37 × 14 =
  18. 18.41 × 24 =
  19. 19.11 × 14 =
  20. 20.25 × 15 =
  21. 21.32 × 24 =
  22. 22.11 × 24 =
  23. 23.25 × 12 =
  24. 24.35 × 15 =
  25. 25.18 × 14 =
  26. 26.14 × 16 =
  27. 27.44 × 18 =
  28. 28.20 × 15 =
  29. 29.28 × 16 =
  30. 30.44 × 12 =
  31. 31.26 × 12 =
  32. 32.13 × 14 =
  33. 33.46 × 14 =
  34. 34.12 × 14 =
  35. 35.12 × 12 =
  36. 36.40 × 14 =
  37. 37.13 × 16 =
  38. 38.42 × 14 =
  39. 39.23 × 14 =
  40. 40.17 × 16 =

Answer key

  1. 448
  2. 432
  3. 888
  4. 276
  5. 490
  6. 348
  7. 624
  8. 810
  9. 592
  10. 165
  11. 450
  12. 462
  13. 688
  14. 630
  15. 308
  16. 364
  17. 518
  18. 984
  19. 154
  20. 375
  21. 768
  22. 264
  23. 300
  24. 525
  25. 252
  26. 224
  27. 792
  28. 300
  29. 448
  30. 528
  31. 312
  32. 182
  33. 644
  34. 168
  35. 144
  36. 560
  37. 208
  38. 588
  39. 322
  40. 272

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