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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 293 · 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. 1.28 × 18 =
  2. 2.19 × 12 =
  3. 3.28 × 24 =
  4. 4.19 × 15 =
  5. 5.13 × 12 =
  6. 6.36 × 16 =
  7. 7.38 × 16 =
  8. 8.28 × 16 =
  9. 9.29 × 16 =
  10. 10.39 × 16 =
  11. 11.45 × 14 =
  12. 12.11 × 14 =
  13. 13.37 × 16 =
  14. 14.41 × 12 =
  15. 15.46 × 24 =
  16. 16.12 × 24 =
  17. 17.32 × 16 =
  18. 18.34 × 12 =
  19. 19.39 × 18 =
  20. 20.35 × 12 =
  21. 21.19 × 18 =
  22. 22.36 × 24 =
  23. 23.12 × 12 =
  24. 24.24 × 12 =
  25. 25.14 × 16 =
  26. 26.24 × 18 =
  27. 27.11 × 24 =
  28. 28.26 × 12 =
  29. 29.21 × 24 =
  30. 30.25 × 12 =
  31. 31.40 × 24 =
  32. 32.21 × 14 =
  33. 33.27 × 16 =
  34. 34.49 × 15 =
  35. 35.13 × 24 =
  36. 36.35 × 18 =
  37. 37.38 × 15 =
  38. 38.14 × 18 =
  39. 39.19 × 24 =
  40. 40.19 × 14 =

Answer key

  1. 504
  2. 228
  3. 672
  4. 285
  5. 156
  6. 576
  7. 608
  8. 448
  9. 464
  10. 624
  11. 630
  12. 154
  13. 592
  14. 492
  15. 1104
  16. 288
  17. 512
  18. 408
  19. 702
  20. 420
  21. 342
  22. 864
  23. 144
  24. 288
  25. 224
  26. 432
  27. 264
  28. 312
  29. 504
  30. 300
  31. 960
  32. 294
  33. 432
  34. 735
  35. 312
  36. 630
  37. 570
  38. 252
  39. 456
  40. 266

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