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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 20 · 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. 1.46 × 16 =
  2. 2.18 × 14 =
  3. 3.32 × 12 =
  4. 4.40 × 14 =
  5. 5.17 × 24 =
  6. 6.12 × 14 =
  7. 7.17 × 15 =
  8. 8.40 × 12 =
  9. 9.36 × 14 =
  10. 10.14 × 16 =
  11. 11.23 × 14 =
  12. 12.28 × 12 =
  13. 13.22 × 18 =
  14. 14.15 × 14 =
  15. 15.37 × 14 =
  16. 16.17 × 14 =
  17. 17.21 × 12 =
  18. 18.28 × 14 =
  19. 19.37 × 16 =
  20. 20.13 × 14 =
  21. 21.45 × 12 =
  22. 22.27 × 14 =
  23. 23.48 × 18 =
  24. 24.30 × 15 =
  25. 25.27 × 24 =
  26. 26.25 × 14 =
  27. 27.20 × 16 =
  28. 28.40 × 18 =
  29. 29.26 × 12 =
  30. 30.19 × 24 =
  31. 31.20 × 14 =
  32. 32.44 × 12 =
  33. 33.21 × 15 =
  34. 34.12 × 15 =
  35. 35.41 × 12 =
  36. 36.19 × 14 =
  37. 37.47 × 12 =
  38. 38.25 × 16 =
  39. 39.28 × 16 =
  40. 40.39 × 24 =

Answer key

  1. 736
  2. 252
  3. 384
  4. 560
  5. 408
  6. 168
  7. 255
  8. 480
  9. 504
  10. 224
  11. 322
  12. 336
  13. 396
  14. 210
  15. 518
  16. 238
  17. 252
  18. 392
  19. 592
  20. 182
  21. 540
  22. 378
  23. 864
  24. 450
  25. 648
  26. 350
  27. 320
  28. 720
  29. 312
  30. 456
  31. 280
  32. 528
  33. 315
  34. 180
  35. 492
  36. 266
  37. 564
  38. 400
  39. 448
  40. 936

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