Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 317 · 40 questions

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).

1. 1.39 × 14 =
2. 2.19 × 12 =
3. 3.25 × 12 =
4. 4.39 × 16 =
5. 5.16 × 14 =
6. 6.33 × 15 =
7. 7.40 × 15 =
8. 8.34 × 14 =
9. 9.15 × 18 =
10. 10.39 × 18 =
11. 11.25 × 18 =
12. 12.42 × 16 =
13. 13.38 × 24 =
14. 14.29 × 15 =
15. 15.15 × 16 =
16. 16.14 × 14 =
17. 17.46 × 18 =
18. 18.35 × 14 =
19. 19.37 × 18 =
20. 20.39 × 15 =
21. 21.47 × 18 =
22. 22.31 × 12 =
23. 23.27 × 15 =
24. 24.38 × 14 =
25. 25.25 × 24 =
26. 26.22 × 24 =
27. 27.47 × 24 =
28. 28.19 × 18 =
29. 29.28 × 12 =
30. 30.45 × 14 =
31. 31.24 × 14 =
32. 32.41 × 12 =
33. 33.17 × 16 =
34. 34.32 × 18 =
35. 35.36 × 15 =
36. 36.42 × 14 =
37. 37.18 × 16 =
38. 38.43 × 18 =
39. 39.20 × 18 =
40. 40.13 × 18 =

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