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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 983 · 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. 1.32 × 12 =
  2. 2.16 × 12 =
  3. 3.25 × 18 =
  4. 4.20 × 12 =
  5. 5.25 × 24 =
  6. 6.13 × 16 =
  7. 7.22 × 15 =
  8. 8.43 × 14 =
  9. 9.34 × 12 =
  10. 10.25 × 15 =
  11. 11.48 × 14 =
  12. 12.22 × 24 =
  13. 13.40 × 14 =
  14. 14.15 × 14 =
  15. 15.28 × 24 =
  16. 16.26 × 12 =
  17. 17.20 × 16 =
  18. 18.48 × 12 =
  19. 19.18 × 18 =
  20. 20.11 × 18 =
  21. 21.40 × 12 =
  22. 22.11 × 15 =
  23. 23.15 × 12 =
  24. 24.49 × 12 =
  25. 25.44 × 18 =
  26. 26.38 × 14 =
  27. 27.30 × 16 =
  28. 28.47 × 14 =
  29. 29.19 × 24 =
  30. 30.34 × 18 =
  31. 31.33 × 14 =
  32. 32.45 × 16 =
  33. 33.31 × 18 =
  34. 34.11 × 24 =
  35. 35.20 × 18 =
  36. 36.29 × 14 =
  37. 37.28 × 18 =
  38. 38.46 × 16 =
  39. 39.13 × 24 =
  40. 40.19 × 16 =

Answer key

  1. 384
  2. 192
  3. 450
  4. 240
  5. 600
  6. 208
  7. 330
  8. 602
  9. 408
  10. 375
  11. 672
  12. 528
  13. 560
  14. 210
  15. 672
  16. 312
  17. 320
  18. 576
  19. 324
  20. 198
  21. 480
  22. 165
  23. 180
  24. 588
  25. 792
  26. 532
  27. 480
  28. 658
  29. 456
  30. 612
  31. 462
  32. 720
  33. 558
  34. 264
  35. 360
  36. 406
  37. 504
  38. 736
  39. 312
  40. 304

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