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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 825 · 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. 1.33 × 14 =
  2. 2.43 × 14 =
  3. 3.38 × 18 =
  4. 4.47 × 16 =
  5. 5.39 × 14 =
  6. 6.13 × 24 =
  7. 7.19 × 14 =
  8. 8.31 × 16 =
  9. 9.18 × 12 =
  10. 10.16 × 15 =
  11. 11.25 × 15 =
  12. 12.11 × 12 =
  13. 13.21 × 14 =
  14. 14.12 × 24 =
  15. 15.28 × 12 =
  16. 16.19 × 24 =
  17. 17.47 × 12 =
  18. 18.49 × 14 =
  19. 19.22 × 12 =
  20. 20.35 × 18 =
  21. 21.13 × 16 =
  22. 22.31 × 14 =
  23. 23.13 × 14 =
  24. 24.14 × 16 =
  25. 25.22 × 16 =
  26. 26.45 × 12 =
  27. 27.26 × 12 =
  28. 28.17 × 15 =
  29. 29.40 × 14 =
  30. 30.15 × 24 =
  31. 31.20 × 24 =
  32. 32.35 × 12 =
  33. 33.43 × 16 =
  34. 34.38 × 15 =
  35. 35.14 × 14 =
  36. 36.34 × 24 =
  37. 37.23 × 12 =
  38. 38.11 × 16 =
  39. 39.26 × 16 =
  40. 40.17 × 14 =

Answer key

  1. 462
  2. 602
  3. 684
  4. 752
  5. 546
  6. 312
  7. 266
  8. 496
  9. 216
  10. 240
  11. 375
  12. 132
  13. 294
  14. 288
  15. 336
  16. 456
  17. 564
  18. 686
  19. 264
  20. 630
  21. 208
  22. 434
  23. 182
  24. 224
  25. 352
  26. 540
  27. 312
  28. 255
  29. 560
  30. 360
  31. 480
  32. 420
  33. 688
  34. 570
  35. 196
  36. 816
  37. 276
  38. 176
  39. 416
  40. 238

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