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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 963 · 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. 1.37 × 16 =
  2. 2.31 × 12 =
  3. 3.16 × 24 =
  4. 4.26 × 12 =
  5. 5.11 × 14 =
  6. 6.11 × 24 =
  7. 7.13 × 24 =
  8. 8.29 × 24 =
  9. 9.13 × 12 =
  10. 10.16 × 15 =
  11. 11.34 × 18 =
  12. 12.26 × 16 =
  13. 13.22 × 16 =
  14. 14.47 × 18 =
  15. 15.37 × 15 =
  16. 16.17 × 16 =
  17. 17.21 × 15 =
  18. 18.31 × 24 =
  19. 19.29 × 16 =
  20. 20.11 × 16 =
  21. 21.27 × 12 =
  22. 22.22 × 18 =
  23. 23.44 × 16 =
  24. 24.49 × 14 =
  25. 25.42 × 18 =
  26. 26.20 × 14 =
  27. 27.12 × 24 =
  28. 28.29 × 18 =
  29. 29.28 × 12 =
  30. 30.23 × 14 =
  31. 31.48 × 14 =
  32. 32.27 × 16 =
  33. 33.49 × 15 =
  34. 34.19 × 16 =
  35. 35.35 × 14 =
  36. 36.32 × 16 =
  37. 37.33 × 24 =
  38. 38.36 × 16 =
  39. 39.38 × 12 =
  40. 40.30 × 12 =

Answer key

  1. 592
  2. 372
  3. 384
  4. 312
  5. 154
  6. 264
  7. 312
  8. 696
  9. 156
  10. 240
  11. 612
  12. 416
  13. 352
  14. 846
  15. 555
  16. 272
  17. 315
  18. 744
  19. 464
  20. 176
  21. 324
  22. 396
  23. 704
  24. 686
  25. 756
  26. 280
  27. 288
  28. 522
  29. 336
  30. 322
  31. 672
  32. 432
  33. 735
  34. 304
  35. 490
  36. 512
  37. 792
  38. 576
  39. 456
  40. 360

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