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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 118 · 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. 1.31 × 16 =
  2. 2.17 × 12 =
  3. 3.17 × 24 =
  4. 4.21 × 12 =
  5. 5.37 × 14 =
  6. 6.19 × 16 =
  7. 7.11 × 14 =
  8. 8.15 × 18 =
  9. 9.18 × 16 =
  10. 10.14 × 14 =
  11. 11.45 × 12 =
  12. 12.38 × 18 =
  13. 13.11 × 12 =
  14. 14.20 × 14 =
  15. 15.16 × 12 =
  16. 16.24 × 14 =
  17. 17.42 × 12 =
  18. 18.30 × 15 =
  19. 19.24 × 18 =
  20. 20.17 × 15 =
  21. 21.32 × 16 =
  22. 22.49 × 15 =
  23. 23.14 × 15 =
  24. 24.36 × 16 =
  25. 25.16 × 16 =
  26. 26.28 × 24 =
  27. 27.16 × 14 =
  28. 28.44 × 14 =
  29. 29.14 × 12 =
  30. 30.42 × 16 =
  31. 31.42 × 14 =
  32. 32.26 × 18 =
  33. 33.44 × 12 =
  34. 34.12 × 18 =
  35. 35.14 × 18 =
  36. 36.22 × 16 =
  37. 37.44 × 16 =
  38. 38.27 × 14 =
  39. 39.32 × 24 =
  40. 40.20 × 24 =

Answer key

  1. 496
  2. 204
  3. 408
  4. 252
  5. 518
  6. 304
  7. 154
  8. 270
  9. 288
  10. 196
  11. 540
  12. 684
  13. 132
  14. 280
  15. 192
  16. 336
  17. 504
  18. 450
  19. 432
  20. 255
  21. 512
  22. 735
  23. 210
  24. 576
  25. 256
  26. 672
  27. 224
  28. 616
  29. 168
  30. 672
  31. 588
  32. 468
  33. 528
  34. 216
  35. 252
  36. 352
  37. 704
  38. 378
  39. 768
  40. 480

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