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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 922 · 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. 1.15 × 14 =
  2. 2.21 × 15 =
  3. 3.37 × 15 =
  4. 4.29 × 15 =
  5. 5.18 × 14 =
  6. 6.14 × 24 =
  7. 7.43 × 15 =
  8. 8.33 × 24 =
  9. 9.48 × 15 =
  10. 10.43 × 14 =
  11. 11.16 × 24 =
  12. 12.34 × 12 =
  13. 13.24 × 24 =
  14. 14.44 × 15 =
  15. 15.14 × 12 =
  16. 16.48 × 18 =
  17. 17.13 × 15 =
  18. 18.37 × 24 =
  19. 19.40 × 12 =
  20. 20.25 × 15 =
  21. 21.12 × 24 =
  22. 22.48 × 12 =
  23. 23.46 × 12 =
  24. 24.19 × 15 =
  25. 25.21 × 14 =
  26. 26.18 × 16 =
  27. 27.19 × 12 =
  28. 28.11 × 12 =
  29. 29.49 × 12 =
  30. 30.29 × 24 =
  31. 31.48 × 14 =
  32. 32.26 × 14 =
  33. 33.34 × 14 =
  34. 34.45 × 12 =
  35. 35.42 × 15 =
  36. 36.19 × 18 =
  37. 37.22 × 16 =
  38. 38.44 × 12 =
  39. 39.46 × 18 =
  40. 40.19 × 14 =

Answer key

  1. 210
  2. 315
  3. 555
  4. 435
  5. 252
  6. 336
  7. 645
  8. 792
  9. 720
  10. 602
  11. 384
  12. 408
  13. 576
  14. 660
  15. 168
  16. 864
  17. 195
  18. 888
  19. 480
  20. 375
  21. 288
  22. 576
  23. 552
  24. 285
  25. 294
  26. 288
  27. 228
  28. 132
  29. 588
  30. 696
  31. 672
  32. 364
  33. 476
  34. 540
  35. 630
  36. 342
  37. 352
  38. 528
  39. 828
  40. 266

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