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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 499 · 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. 1.30 × 24 =
  2. 2.25 × 12 =
  3. 3.15 × 12 =
  4. 4.18 × 16 =
  5. 5.42 × 12 =
  6. 6.37 × 14 =
  7. 7.12 × 12 =
  8. 8.42 × 14 =
  9. 9.44 × 12 =
  10. 10.16 × 12 =
  11. 11.49 × 16 =
  12. 12.26 × 14 =
  13. 13.40 × 14 =
  14. 14.29 × 14 =
  15. 15.12 × 16 =
  16. 16.37 × 16 =
  17. 17.47 × 12 =
  18. 18.19 × 18 =
  19. 19.29 × 24 =
  20. 20.32 × 18 =
  21. 21.23 × 24 =
  22. 22.41 × 15 =
  23. 23.22 × 12 =
  24. 24.35 × 14 =
  25. 25.36 × 15 =
  26. 26.13 × 14 =
  27. 27.26 × 12 =
  28. 28.30 × 12 =
  29. 29.31 × 15 =
  30. 30.49 × 14 =
  31. 31.26 × 15 =
  32. 32.45 × 16 =
  33. 33.48 × 14 =
  34. 34.41 × 16 =
  35. 35.36 × 14 =
  36. 36.33 × 14 =
  37. 37.29 × 12 =
  38. 38.21 × 12 =
  39. 39.21 × 16 =
  40. 40.43 × 12 =

Answer key

  1. 720
  2. 300
  3. 180
  4. 288
  5. 504
  6. 518
  7. 144
  8. 588
  9. 528
  10. 192
  11. 784
  12. 364
  13. 560
  14. 406
  15. 192
  16. 592
  17. 564
  18. 342
  19. 696
  20. 576
  21. 552
  22. 615
  23. 264
  24. 490
  25. 540
  26. 182
  27. 312
  28. 360
  29. 465
  30. 686
  31. 390
  32. 720
  33. 672
  34. 656
  35. 504
  36. 462
  37. 348
  38. 252
  39. 336
  40. 516

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