Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 867 · 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. 1.24 × 14 =
2. 2.39 × 14 =
3. 3.23 × 14 =
4. 4.20 × 12 =
5. 5.47 × 12 =
6. 6.49 × 18 =
7. 7.30 × 14 =
8. 8.35 × 12 =
9. 9.26 × 14 =
10. 10.25 × 18 =
11. 11.13 × 15 =
12. 12.11 × 12 =
13. 13.11 × 14 =
14. 14.40 × 15 =
15. 15.13 × 18 =
16. 16.24 × 12 =
17. 17.21 × 18 =
18. 18.17 × 24 =
19. 19.18 × 24 =
20. 20.17 × 12 =
21. 21.17 × 14 =
22. 22.41 × 12 =
23. 23.32 × 14 =
24. 24.46 × 16 =
25. 25.14 × 14 =
26. 26.23 × 24 =
27. 27.45 × 16 =
28. 28.30 × 15 =
29. 29.32 × 12 =
30. 30.37 × 16 =
31. 31.33 × 14 =
32. 32.12 × 15 =
33. 33.45 × 18 =
34. 34.31 × 18 =
35. 35.48 × 16 =
36. 36.43 × 18 =
37. 37.42 × 16 =
38. 38.31 × 12 =
39. 39.39 × 24 =
40. 40.25 × 24 =

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