Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 576 · 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. 1.18 × 14 =
2. 2.34 × 12 =
3. 3.45 × 18 =
4. 4.22 × 16 =
5. 5.22 × 14 =
6. 6.38 × 18 =
7. 7.14 × 24 =
8. 8.47 × 24 =
9. 9.46 × 18 =
10. 10.48 × 14 =
11. 11.12 × 14 =
12. 12.32 × 24 =
13. 13.41 × 14 =
14. 14.41 × 18 =
15. 15.19 × 14 =
16. 16.25 × 18 =
17. 17.12 × 18 =
18. 18.14 × 12 =
19. 19.26 × 24 =
20. 20.47 × 15 =
21. 21.42 × 12 =
22. 22.44 × 15 =
23. 23.42 × 18 =
24. 24.37 × 14 =
25. 25.37 × 15 =
26. 26.14 × 16 =
27. 27.38 × 14 =
28. 28.49 × 16 =
29. 29.44 × 24 =
30. 30.30 × 12 =
31. 31.17 × 24 =
32. 32.15 × 15 =
33. 33.35 × 16 =
34. 34.36 × 14 =
35. 35.37 × 24 =
36. 36.44 × 12 =
37. 37.22 × 12 =
38. 38.45 × 24 =
39. 39.19 × 18 =
40. 40.21 × 12 =

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