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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 382 · 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 × 18 =
  2. 2.21 × 12 =
  3. 3.37 × 18 =
  4. 4.29 × 12 =
  5. 5.32 × 12 =
  6. 6.34 × 12 =
  7. 7.35 × 14 =
  8. 8.12 × 14 =
  9. 9.24 × 12 =
  10. 10.16 × 16 =
  11. 11.42 × 14 =
  12. 12.44 × 16 =
  13. 13.21 × 16 =
  14. 14.49 × 12 =
  15. 15.12 × 15 =
  16. 16.41 × 12 =
  17. 17.33 × 12 =
  18. 18.12 × 24 =
  19. 19.36 × 24 =
  20. 20.35 × 12 =
  21. 21.32 × 18 =
  22. 22.37 × 14 =
  23. 23.33 × 18 =
  24. 24.44 × 15 =
  25. 25.27 × 24 =
  26. 26.35 × 24 =
  27. 27.45 × 16 =
  28. 28.26 × 14 =
  29. 29.47 × 18 =
  30. 30.47 × 14 =
  31. 31.28 × 18 =
  32. 32.43 × 14 =
  33. 33.31 × 15 =
  34. 34.11 × 12 =
  35. 35.43 × 16 =
  36. 36.49 × 16 =
  37. 37.34 × 24 =
  38. 38.49 × 18 =
  39. 39.16 × 24 =
  40. 40.40 × 14 =

Answer key

  1. 414
  2. 252
  3. 666
  4. 348
  5. 384
  6. 408
  7. 490
  8. 168
  9. 288
  10. 256
  11. 588
  12. 704
  13. 336
  14. 588
  15. 180
  16. 492
  17. 396
  18. 288
  19. 864
  20. 420
  21. 576
  22. 518
  23. 594
  24. 660
  25. 648
  26. 840
  27. 720
  28. 364
  29. 846
  30. 658
  31. 504
  32. 602
  33. 465
  34. 132
  35. 688
  36. 784
  37. 816
  38. 882
  39. 384
  40. 560

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