Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 260 · 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. 1.42 × 14 =
2. 2.32 × 12 =
3. 3.25 × 12 =
4. 4.45 × 24 =
5. 5.17 × 18 =
6. 6.26 × 18 =
7. 7.16 × 12 =
8. 8.46 × 15 =
9. 9.43 × 12 =
10. 10.26 × 14 =
11. 11.44 × 15 =
12. 12.42 × 24 =
13. 13.11 × 24 =
14. 14.49 × 15 =
15. 15.41 × 12 =
16. 16.35 × 15 =
17. 17.32 × 24 =
18. 18.13 × 12 =
19. 19.23 × 18 =
20. 20.17 × 14 =
21. 21.13 × 18 =
22. 22.40 × 14 =
23. 23.21 × 12 =
24. 24.33 × 15 =
25. 25.33 × 12 =
26. 26.26 × 12 =
27. 27.20 × 12 =
28. 28.44 × 14 =
29. 29.13 × 14 =
30. 30.43 × 24 =
31. 31.23 × 12 =
32. 32.18 × 16 =
33. 33.15 × 14 =
34. 34.25 × 14 =
35. 35.22 × 12 =
36. 36.33 × 24 =
37. 37.30 × 14 =
38. 38.20 × 15 =
39. 39.16 × 24 =
40. 40.47 × 15 =

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