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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 972 · 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. 1.26 × 18 =
  2. 2.14 × 14 =
  3. 3.40 × 18 =
  4. 4.47 × 12 =
  5. 5.32 × 16 =
  6. 6.48 × 12 =
  7. 7.18 × 15 =
  8. 8.49 × 15 =
  9. 9.18 × 14 =
  10. 10.28 × 18 =
  11. 11.17 × 24 =
  12. 12.11 × 12 =
  13. 13.26 × 15 =
  14. 14.12 × 14 =
  15. 15.29 × 24 =
  16. 16.28 × 16 =
  17. 17.27 × 14 =
  18. 18.29 × 14 =
  19. 19.17 × 12 =
  20. 20.25 × 12 =
  21. 21.29 × 12 =
  22. 22.43 × 14 =
  23. 23.35 × 15 =
  24. 24.33 × 24 =
  25. 25.12 × 12 =
  26. 26.43 × 15 =
  27. 27.26 × 24 =
  28. 28.35 × 14 =
  29. 29.41 × 14 =
  30. 30.25 × 14 =
  31. 31.11 × 14 =
  32. 32.20 × 14 =
  33. 33.44 × 18 =
  34. 34.36 × 14 =
  35. 35.30 × 12 =
  36. 36.32 × 15 =
  37. 37.35 × 18 =
  38. 38.41 × 12 =
  39. 39.13 × 14 =
  40. 40.15 × 18 =

Answer key

  1. 468
  2. 196
  3. 720
  4. 564
  5. 512
  6. 576
  7. 270
  8. 735
  9. 252
  10. 504
  11. 408
  12. 132
  13. 390
  14. 168
  15. 696
  16. 448
  17. 378
  18. 406
  19. 204
  20. 300
  21. 348
  22. 602
  23. 525
  24. 792
  25. 144
  26. 645
  27. 624
  28. 490
  29. 574
  30. 350
  31. 154
  32. 280
  33. 792
  34. 504
  35. 360
  36. 480
  37. 630
  38. 492
  39. 182
  40. 270

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