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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 206 · 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. 1.13 × 12 =
  2. 2.29 × 16 =
  3. 3.11 × 24 =
  4. 4.11 × 15 =
  5. 5.21 × 16 =
  6. 6.37 × 15 =
  7. 7.18 × 14 =
  8. 8.49 × 18 =
  9. 9.20 × 12 =
  10. 10.29 × 15 =
  11. 11.42 × 18 =
  12. 12.16 × 18 =
  13. 13.39 × 18 =
  14. 14.30 × 16 =
  15. 15.26 × 12 =
  16. 16.49 × 12 =
  17. 17.46 × 12 =
  18. 18.22 × 14 =
  19. 19.38 × 15 =
  20. 20.35 × 15 =
  21. 21.22 × 12 =
  22. 22.24 × 12 =
  23. 23.45 × 18 =
  24. 24.46 × 14 =
  25. 25.38 × 12 =
  26. 26.21 × 18 =
  27. 27.28 × 14 =
  28. 28.27 × 24 =
  29. 29.17 × 14 =
  30. 30.36 × 14 =
  31. 31.30 × 18 =
  32. 32.44 × 14 =
  33. 33.20 × 24 =
  34. 34.26 × 24 =
  35. 35.41 × 15 =
  36. 36.12 × 12 =
  37. 37.48 × 14 =
  38. 38.12 × 16 =
  39. 39.13 × 14 =
  40. 40.45 × 14 =

Answer key

  1. 156
  2. 464
  3. 264
  4. 165
  5. 336
  6. 555
  7. 252
  8. 882
  9. 240
  10. 435
  11. 756
  12. 288
  13. 702
  14. 480
  15. 312
  16. 588
  17. 552
  18. 308
  19. 570
  20. 525
  21. 264
  22. 288
  23. 810
  24. 644
  25. 456
  26. 378
  27. 392
  28. 648
  29. 238
  30. 504
  31. 540
  32. 616
  33. 480
  34. 624
  35. 615
  36. 144
  37. 672
  38. 192
  39. 182
  40. 630

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