Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 418 · 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. 1.12 × 14 =
2. 2.34 × 24 =
3. 3.22 × 18 =
4. 4.48 × 18 =
5. 5.26 × 18 =
6. 6.19 × 12 =
7. 7.13 × 14 =
8. 8.22 × 15 =
9. 9.11 × 24 =
10. 10.39 × 14 =
11. 11.16 × 18 =
12. 12.28 × 15 =
13. 13.11 × 14 =
14. 14.35 × 12 =
15. 15.32 × 14 =
16. 16.37 × 12 =
17. 17.20 × 18 =
18. 18.34 × 16 =
19. 19.31 × 12 =
20. 20.21 × 12 =
21. 21.49 × 12 =
22. 22.17 × 15 =
23. 23.49 × 15 =
24. 24.16 × 14 =
25. 25.15 × 12 =
26. 26.15 × 16 =
27. 27.20 × 14 =
28. 28.17 × 24 =
29. 29.18 × 15 =
30. 30.42 × 18 =
31. 31.31 × 24 =
32. 32.46 × 16 =
33. 33.44 × 14 =
34. 34.26 × 15 =
35. 35.45 × 14 =
36. 36.29 × 12 =
37. 37.48 × 24 =
38. 38.33 × 14 =
39. 39.18 × 24 =
40. 40.20 × 12 =

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