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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 808 · 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. 1.16 × 16 =
  2. 2.16 × 14 =
  3. 3.16 × 15 =
  4. 4.36 × 12 =
  5. 5.33 × 14 =
  6. 6.33 × 12 =
  7. 7.15 × 16 =
  8. 8.13 × 15 =
  9. 9.18 × 12 =
  10. 10.12 × 12 =
  11. 11.36 × 14 =
  12. 12.37 × 15 =
  13. 13.30 × 24 =
  14. 14.24 × 24 =
  15. 15.12 × 18 =
  16. 16.29 × 14 =
  17. 17.18 × 15 =
  18. 18.36 × 24 =
  19. 19.27 × 15 =
  20. 20.15 × 24 =
  21. 21.22 × 12 =
  22. 22.48 × 16 =
  23. 23.19 × 14 =
  24. 24.25 × 15 =
  25. 25.14 × 24 =
  26. 26.38 × 18 =
  27. 27.18 × 16 =
  28. 28.20 × 14 =
  29. 29.18 × 14 =
  30. 30.45 × 16 =
  31. 31.12 × 14 =
  32. 32.40 × 12 =
  33. 33.21 × 14 =
  34. 34.33 × 24 =
  35. 35.26 × 18 =
  36. 36.19 × 16 =
  37. 37.13 × 18 =
  38. 38.21 × 16 =
  39. 39.19 × 15 =
  40. 40.28 × 18 =

Answer key

  1. 256
  2. 224
  3. 240
  4. 432
  5. 462
  6. 396
  7. 240
  8. 195
  9. 216
  10. 144
  11. 504
  12. 555
  13. 720
  14. 576
  15. 216
  16. 406
  17. 270
  18. 864
  19. 405
  20. 360
  21. 264
  22. 768
  23. 266
  24. 375
  25. 336
  26. 684
  27. 288
  28. 280
  29. 252
  30. 720
  31. 168
  32. 480
  33. 294
  34. 792
  35. 468
  36. 304
  37. 234
  38. 336
  39. 285
  40. 504

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