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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 197 · 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. 1.15 × 14 =
  2. 2.12 × 24 =
  3. 3.22 × 12 =
  4. 4.11 × 12 =
  5. 5.28 × 16 =
  6. 6.16 × 18 =
  7. 7.19 × 14 =
  8. 8.31 × 16 =
  9. 9.24 × 14 =
  10. 10.44 × 18 =
  11. 11.30 × 12 =
  12. 12.27 × 14 =
  13. 13.41 × 18 =
  14. 14.43 × 24 =
  15. 15.26 × 18 =
  16. 16.39 × 24 =
  17. 17.17 × 12 =
  18. 18.31 × 24 =
  19. 19.24 × 12 =
  20. 20.14 × 16 =
  21. 21.11 × 14 =
  22. 22.11 × 15 =
  23. 23.24 × 15 =
  24. 24.18 × 15 =
  25. 25.22 × 16 =
  26. 26.46 × 14 =
  27. 27.38 × 14 =
  28. 28.48 × 12 =
  29. 29.14 × 15 =
  30. 30.20 × 16 =
  31. 31.20 × 12 =
  32. 32.21 × 15 =
  33. 33.23 × 15 =
  34. 34.21 × 14 =
  35. 35.43 × 14 =
  36. 36.35 × 12 =
  37. 37.11 × 16 =
  38. 38.29 × 16 =
  39. 39.39 × 14 =
  40. 40.36 × 24 =

Answer key

  1. 210
  2. 288
  3. 264
  4. 132
  5. 448
  6. 288
  7. 266
  8. 496
  9. 336
  10. 792
  11. 360
  12. 378
  13. 738
  14. 1032
  15. 468
  16. 936
  17. 204
  18. 744
  19. 288
  20. 224
  21. 154
  22. 165
  23. 360
  24. 270
  25. 352
  26. 644
  27. 532
  28. 576
  29. 210
  30. 320
  31. 240
  32. 315
  33. 345
  34. 294
  35. 602
  36. 420
  37. 176
  38. 464
  39. 546
  40. 864

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