Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 645 · 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. 2.23 × 14 =
3. 3.17 × 14 =
4. 4.23 × 24 =
5. 5.36 × 15 =
6. 6.34 × 14 =
7. 7.31 × 16 =
8. 8.22 × 14 =
9. 9.15 × 14 =
10. 10.23 × 16 =
11. 11.46 × 14 =
12. 12.14 × 14 =
13. 13.42 × 18 =
14. 14.38 × 24 =
15. 15.39 × 24 =
16. 16.32 × 18 =
17. 17.16 × 16 =
18. 18.35 × 16 =
19. 19.43 × 24 =
20. 20.42 × 15 =
21. 21.17 × 24 =
22. 22.42 × 12 =
23. 23.48 × 16 =
24. 24.18 × 24 =
25. 25.21 × 14 =
26. 26.12 × 16 =
27. 27.43 × 12 =
28. 28.15 × 24 =
29. 29.19 × 18 =
30. 30.47 × 18 =
31. 31.44 × 18 =
32. 32.37 × 18 =
33. 33.49 × 12 =
34. 34.26 × 14 =
35. 35.40 × 18 =
36. 36.39 × 18 =
37. 37.44 × 15 =
38. 38.11 × 14 =
39. 39.40 × 15 =
40. 40.11 × 24 =

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