Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 748 · 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. 2.46 × 24 =
3. 3.21 × 12 =
4. 4.18 × 12 =
5. 5.36 × 24 =
6. 6.35 × 14 =
7. 7.11 × 24 =
8. 8.11 × 15 =
9. 9.33 × 16 =
10. 10.28 × 14 =
11. 11.34 × 16 =
12. 12.15 × 16 =
13. 13.23 × 18 =
14. 14.26 × 24 =
15. 15.18 × 16 =
16. 16.13 × 14 =
17. 17.30 × 18 =
18. 18.24 × 14 =
19. 19.31 × 14 =
20. 20.44 × 12 =
21. 21.14 × 16 =
22. 22.11 × 12 =
23. 23.43 × 15 =
24. 24.30 × 14 =
25. 25.22 × 16 =
26. 26.40 × 14 =
27. 27.22 × 24 =
28. 28.28 × 12 =
29. 29.26 × 18 =
30. 30.30 × 16 =
31. 31.24 × 15 =
32. 32.14 × 12 =
33. 33.42 × 15 =
34. 34.35 × 12 =
35. 35.39 × 24 =
36. 36.22 × 12 =
37. 37.19 × 16 =
38. 38.34 × 12 =
39. 39.38 × 18 =
40. 40.14 × 24 =

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