Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 874 · 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. 1.46 × 14 =
2. 2.15 × 14 =
3. 3.15 × 12 =
4. 4.42 × 14 =
5. 5.32 × 24 =
6. 6.49 × 16 =
7. 7.45 × 24 =
8. 8.18 × 24 =
9. 9.33 × 12 =
10. 10.46 × 16 =
11. 11.34 × 15 =
12. 12.37 × 12 =
13. 13.28 × 16 =
14. 14.37 × 15 =
15. 15.13 × 24 =
16. 16.25 × 12 =
17. 17.38 × 16 =
18. 18.34 × 14 =
19. 19.11 × 18 =
20. 20.28 × 12 =
21. 21.46 × 24 =
22. 22.41 × 18 =
23. 23.11 × 15 =
24. 24.45 × 12 =
25. 25.20 × 18 =
26. 26.17 × 18 =
27. 27.12 × 12 =
28. 28.40 × 24 =
29. 29.34 × 12 =
30. 30.21 × 14 =
31. 31.24 × 15 =
32. 32.41 × 15 =
33. 33.43 × 12 =
34. 34.20 × 12 =
35. 35.32 × 15 =
36. 36.14 × 24 =
37. 37.31 × 16 =
38. 38.35 × 18 =
39. 39.45 × 15 =
40. 40.20 × 16 =

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