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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 977 · 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. 1.41 × 14 =
  2. 2.12 × 14 =
  3. 3.17 × 16 =
  4. 4.45 × 15 =
  5. 5.21 × 15 =
  6. 6.17 × 18 =
  7. 7.21 × 24 =
  8. 8.33 × 15 =
  9. 9.23 × 24 =
  10. 10.43 × 12 =
  11. 11.39 × 18 =
  12. 12.29 × 18 =
  13. 13.40 × 14 =
  14. 14.37 × 14 =
  15. 15.40 × 24 =
  16. 16.26 × 12 =
  17. 17.23 × 12 =
  18. 18.26 × 18 =
  19. 19.47 × 15 =
  20. 20.27 × 12 =
  21. 21.22 × 15 =
  22. 22.19 × 24 =
  23. 23.39 × 12 =
  24. 24.44 × 16 =
  25. 25.39 × 24 =
  26. 26.20 × 24 =
  27. 27.38 × 18 =
  28. 28.19 × 14 =
  29. 29.39 × 15 =
  30. 30.16 × 16 =
  31. 31.36 × 12 =
  32. 32.19 × 15 =
  33. 33.20 × 18 =
  34. 34.28 × 14 =
  35. 35.48 × 18 =
  36. 36.29 × 15 =
  37. 37.19 × 18 =
  38. 38.45 × 14 =
  39. 39.26 × 14 =
  40. 40.30 × 24 =

Answer key

  1. 574
  2. 168
  3. 272
  4. 675
  5. 315
  6. 306
  7. 504
  8. 495
  9. 552
  10. 516
  11. 702
  12. 522
  13. 560
  14. 518
  15. 960
  16. 312
  17. 276
  18. 468
  19. 705
  20. 324
  21. 330
  22. 456
  23. 468
  24. 704
  25. 936
  26. 480
  27. 684
  28. 266
  29. 585
  30. 256
  31. 432
  32. 285
  33. 360
  34. 392
  35. 864
  36. 435
  37. 342
  38. 630
  39. 364
  40. 720

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