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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 871 · 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. 1.40 × 24 =
  2. 2.30 × 15 =
  3. 3.35 × 15 =
  4. 4.35 × 24 =
  5. 5.28 × 14 =
  6. 6.40 × 15 =
  7. 7.16 × 12 =
  8. 8.37 × 14 =
  9. 9.49 × 15 =
  10. 10.14 × 24 =
  11. 11.31 × 16 =
  12. 12.44 × 12 =
  13. 13.39 × 24 =
  14. 14.26 × 14 =
  15. 15.12 × 18 =
  16. 16.18 × 24 =
  17. 17.14 × 16 =
  18. 18.48 × 24 =
  19. 19.37 × 15 =
  20. 20.24 × 12 =
  21. 21.41 × 12 =
  22. 22.41 × 16 =
  23. 23.47 × 18 =
  24. 24.24 × 24 =
  25. 25.11 × 24 =
  26. 26.37 × 18 =
  27. 27.29 × 12 =
  28. 28.17 × 14 =
  29. 29.11 × 16 =
  30. 30.49 × 18 =
  31. 31.36 × 24 =
  32. 32.12 × 12 =
  33. 33.26 × 15 =
  34. 34.19 × 24 =
  35. 35.13 × 16 =
  36. 36.27 × 24 =
  37. 37.25 × 15 =
  38. 38.22 × 15 =
  39. 39.35 × 12 =
  40. 40.34 × 15 =

Answer key

  1. 960
  2. 450
  3. 525
  4. 840
  5. 392
  6. 600
  7. 192
  8. 518
  9. 735
  10. 336
  11. 496
  12. 528
  13. 936
  14. 364
  15. 216
  16. 432
  17. 224
  18. 1152
  19. 555
  20. 288
  21. 492
  22. 656
  23. 846
  24. 576
  25. 264
  26. 666
  27. 348
  28. 238
  29. 176
  30. 882
  31. 864
  32. 144
  33. 390
  34. 456
  35. 208
  36. 648
  37. 375
  38. 330
  39. 420
  40. 510

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