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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 735 · 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. 1.14 × 16 =
  2. 2.28 × 18 =
  3. 3.41 × 14 =
  4. 4.34 × 24 =
  5. 5.36 × 12 =
  6. 6.30 × 14 =
  7. 7.19 × 24 =
  8. 8.20 × 14 =
  9. 9.44 × 14 =
  10. 10.26 × 18 =
  11. 11.35 × 12 =
  12. 12.34 × 16 =
  13. 13.29 × 12 =
  14. 14.20 × 12 =
  15. 15.12 × 14 =
  16. 16.49 × 16 =
  17. 17.24 × 12 =
  18. 18.45 × 16 =
  19. 19.37 × 14 =
  20. 20.25 × 24 =
  21. 21.23 × 12 =
  22. 22.16 × 16 =
  23. 23.34 × 12 =
  24. 24.21 × 18 =
  25. 25.38 × 14 =
  26. 26.20 × 18 =
  27. 27.33 × 14 =
  28. 28.41 × 12 =
  29. 29.32 × 12 =
  30. 30.31 × 18 =
  31. 31.24 × 15 =
  32. 32.18 × 14 =
  33. 33.39 × 14 =
  34. 34.11 × 14 =
  35. 35.19 × 18 =
  36. 36.41 × 18 =
  37. 37.22 × 12 =
  38. 38.49 × 15 =
  39. 39.27 × 15 =
  40. 40.44 × 16 =

Answer key

  1. 224
  2. 504
  3. 574
  4. 816
  5. 432
  6. 420
  7. 456
  8. 280
  9. 616
  10. 468
  11. 420
  12. 544
  13. 348
  14. 240
  15. 168
  16. 784
  17. 288
  18. 720
  19. 518
  20. 600
  21. 276
  22. 256
  23. 408
  24. 378
  25. 532
  26. 360
  27. 462
  28. 492
  29. 384
  30. 558
  31. 360
  32. 252
  33. 546
  34. 154
  35. 342
  36. 738
  37. 264
  38. 735
  39. 405
  40. 704

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