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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 708 · 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. 1.31 × 12 =
  2. 2.19 × 14 =
  3. 3.16 × 18 =
  4. 4.12 × 24 =
  5. 5.18 × 14 =
  6. 6.48 × 14 =
  7. 7.24 × 16 =
  8. 8.32 × 14 =
  9. 9.25 × 24 =
  10. 10.34 × 24 =
  11. 11.19 × 15 =
  12. 12.17 × 24 =
  13. 13.16 × 14 =
  14. 14.26 × 18 =
  15. 15.12 × 14 =
  16. 16.15 × 14 =
  17. 17.23 × 15 =
  18. 18.40 × 15 =
  19. 19.23 × 24 =
  20. 20.13 × 14 =
  21. 21.11 × 15 =
  22. 22.11 × 14 =
  23. 23.14 × 12 =
  24. 24.40 × 16 =
  25. 25.38 × 16 =
  26. 26.24 × 15 =
  27. 27.17 × 16 =
  28. 28.12 × 15 =
  29. 29.27 × 15 =
  30. 30.29 × 12 =
  31. 31.40 × 18 =
  32. 32.46 × 15 =
  33. 33.38 × 14 =
  34. 34.43 × 12 =
  35. 35.20 × 12 =
  36. 36.15 × 12 =
  37. 37.13 × 12 =
  38. 38.42 × 16 =
  39. 39.15 × 16 =
  40. 40.45 × 14 =

Answer key

  1. 372
  2. 266
  3. 288
  4. 288
  5. 252
  6. 672
  7. 384
  8. 448
  9. 600
  10. 816
  11. 285
  12. 408
  13. 224
  14. 468
  15. 168
  16. 210
  17. 345
  18. 600
  19. 552
  20. 182
  21. 165
  22. 154
  23. 168
  24. 640
  25. 608
  26. 360
  27. 272
  28. 180
  29. 405
  30. 348
  31. 720
  32. 690
  33. 532
  34. 516
  35. 240
  36. 180
  37. 156
  38. 672
  39. 240
  40. 630

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