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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 686 · 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. 1.39 × 12 =
  2. 2.23 × 16 =
  3. 3.34 × 24 =
  4. 4.48 × 18 =
  5. 5.38 × 18 =
  6. 6.21 × 12 =
  7. 7.37 × 15 =
  8. 8.18 × 16 =
  9. 9.42 × 14 =
  10. 10.22 × 15 =
  11. 11.28 × 12 =
  12. 12.48 × 12 =
  13. 13.27 × 14 =
  14. 14.20 × 12 =
  15. 15.26 × 12 =
  16. 16.35 × 16 =
  17. 17.30 × 18 =
  18. 18.20 × 14 =
  19. 19.17 × 16 =
  20. 20.42 × 12 =
  21. 21.23 × 24 =
  22. 22.44 × 16 =
  23. 23.43 × 14 =
  24. 24.16 × 16 =
  25. 25.41 × 16 =
  26. 26.22 × 14 =
  27. 27.16 × 14 =
  28. 28.21 × 14 =
  29. 29.40 × 14 =
  30. 30.14 × 18 =
  31. 31.11 × 24 =
  32. 32.43 × 12 =
  33. 33.28 × 18 =
  34. 34.45 × 15 =
  35. 35.37 × 16 =
  36. 36.32 × 16 =
  37. 37.46 × 16 =
  38. 38.36 × 14 =
  39. 39.29 × 12 =
  40. 40.33 × 24 =

Answer key

  1. 468
  2. 368
  3. 816
  4. 864
  5. 684
  6. 252
  7. 555
  8. 288
  9. 588
  10. 330
  11. 336
  12. 576
  13. 378
  14. 240
  15. 312
  16. 560
  17. 540
  18. 280
  19. 272
  20. 504
  21. 552
  22. 704
  23. 602
  24. 256
  25. 656
  26. 308
  27. 224
  28. 294
  29. 560
  30. 252
  31. 264
  32. 516
  33. 504
  34. 675
  35. 592
  36. 512
  37. 736
  38. 504
  39. 348
  40. 792

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