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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 907 · 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. 1.12 × 14 =
  2. 2.42 × 18 =
  3. 3.38 × 14 =
  4. 4.17 × 18 =
  5. 5.15 × 18 =
  6. 6.19 × 16 =
  7. 7.22 × 15 =
  8. 8.45 × 18 =
  9. 9.45 × 14 =
  10. 10.44 × 18 =
  11. 11.11 × 15 =
  12. 12.19 × 12 =
  13. 13.31 × 14 =
  14. 14.26 × 24 =
  15. 15.36 × 16 =
  16. 16.36 × 12 =
  17. 17.14 × 12 =
  18. 18.23 × 24 =
  19. 19.30 × 16 =
  20. 20.19 × 24 =
  21. 21.25 × 18 =
  22. 22.38 × 18 =
  23. 23.46 × 14 =
  24. 24.30 × 15 =
  25. 25.44 × 16 =
  26. 26.28 × 16 =
  27. 27.45 × 16 =
  28. 28.14 × 14 =
  29. 29.31 × 12 =
  30. 30.27 × 14 =
  31. 31.47 × 12 =
  32. 32.29 × 24 =
  33. 33.38 × 24 =
  34. 34.14 × 24 =
  35. 35.27 × 16 =
  36. 36.11 × 18 =
  37. 37.18 × 16 =
  38. 38.17 × 12 =
  39. 39.43 × 15 =
  40. 40.28 × 12 =

Answer key

  1. 168
  2. 756
  3. 532
  4. 306
  5. 270
  6. 304
  7. 330
  8. 810
  9. 630
  10. 792
  11. 165
  12. 228
  13. 434
  14. 624
  15. 576
  16. 432
  17. 168
  18. 552
  19. 480
  20. 456
  21. 450
  22. 684
  23. 644
  24. 450
  25. 704
  26. 448
  27. 720
  28. 196
  29. 372
  30. 378
  31. 564
  32. 696
  33. 912
  34. 336
  35. 432
  36. 198
  37. 288
  38. 204
  39. 645
  40. 336

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