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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 299 · 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. 1.22 × 16 =
  2. 2.13 × 24 =
  3. 3.40 × 14 =
  4. 4.12 × 24 =
  5. 5.26 × 15 =
  6. 6.41 × 12 =
  7. 7.19 × 24 =
  8. 8.22 × 14 =
  9. 9.32 × 18 =
  10. 10.23 × 16 =
  11. 11.21 × 16 =
  12. 12.46 × 15 =
  13. 13.37 × 24 =
  14. 14.49 × 16 =
  15. 15.49 × 12 =
  16. 16.15 × 12 =
  17. 17.27 × 15 =
  18. 18.11 × 18 =
  19. 19.36 × 14 =
  20. 20.47 × 15 =
  21. 21.39 × 24 =
  22. 22.32 × 16 =
  23. 23.20 × 24 =
  24. 24.14 × 12 =
  25. 25.20 × 16 =
  26. 26.32 × 24 =
  27. 27.39 × 16 =
  28. 28.16 × 16 =
  29. 29.18 × 14 =
  30. 30.26 × 12 =
  31. 31.23 × 18 =
  32. 32.47 × 18 =
  33. 33.16 × 14 =
  34. 34.34 × 12 =
  35. 35.21 × 12 =
  36. 36.35 × 15 =
  37. 37.42 × 18 =
  38. 38.11 × 15 =
  39. 39.28 × 12 =
  40. 40.42 × 16 =

Answer key

  1. 352
  2. 312
  3. 560
  4. 288
  5. 390
  6. 492
  7. 456
  8. 308
  9. 576
  10. 368
  11. 336
  12. 690
  13. 888
  14. 784
  15. 588
  16. 180
  17. 405
  18. 198
  19. 504
  20. 705
  21. 936
  22. 512
  23. 480
  24. 168
  25. 320
  26. 768
  27. 624
  28. 256
  29. 252
  30. 312
  31. 414
  32. 846
  33. 224
  34. 408
  35. 252
  36. 525
  37. 756
  38. 165
  39. 336
  40. 672

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