Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 245 · 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. 1.24 × 14 =
2. 2.22 × 12 =
3. 3.34 × 24 =
4. 4.20 × 16 =
5. 5.31 × 18 =
6. 6.18 × 15 =
7. 7.17 × 14 =
8. 8.35 × 14 =
9. 9.13 × 12 =
10. 10.48 × 15 =
11. 11.25 × 18 =
12. 12.28 × 12 =
13. 13.39 × 16 =
14. 14.17 × 16 =
15. 15.15 × 12 =
16. 16.27 × 14 =
17. 17.41 × 12 =
18. 18.25 × 14 =
19. 19.16 × 24 =
20. 20.39 × 15 =
21. 21.21 × 16 =
22. 22.32 × 14 =
23. 23.36 × 24 =
24. 24.48 × 24 =
25. 25.42 × 18 =
26. 26.23 × 16 =
27. 27.23 × 14 =
28. 28.40 × 18 =
29. 29.42 × 16 =
30. 30.38 × 18 =
31. 31.16 × 14 =
32. 32.27 × 16 =
33. 33.42 × 14 =
34. 34.30 × 12 =
35. 35.41 × 15 =
36. 36.27 × 15 =
37. 37.48 × 16 =
38. 38.31 × 15 =
39. 39.14 × 24 =
40. 40.42 × 12 =

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