Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 227 · 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. 1.43 × 12 =
2. 2.42 × 12 =
3. 3.12 × 14 =
4. 4.20 × 16 =
5. 5.15 × 15 =
6. 6.46 × 15 =
7. 7.47 × 12 =
8. 8.43 × 24 =
9. 9.16 × 16 =
10. 10.34 × 14 =
11. 11.20 × 18 =
12. 12.39 × 14 =
13. 13.15 × 18 =
14. 14.29 × 18 =
15. 15.24 × 12 =
16. 16.45 × 12 =
17. 17.47 × 14 =
18. 18.19 × 24 =
19. 19.33 × 15 =
20. 20.29 × 14 =
21. 21.11 × 24 =
22. 22.16 × 12 =
23. 23.12 × 16 =
24. 24.36 × 24 =
25. 25.21 × 16 =
26. 26.24 × 24 =
27. 27.16 × 24 =
28. 28.12 × 12 =
29. 29.40 × 18 =
30. 30.48 × 18 =
31. 31.24 × 18 =
32. 32.28 × 14 =
33. 33.46 × 12 =
34. 34.36 × 16 =
35. 35.44 × 14 =
36. 36.13 × 15 =
37. 37.25 × 14 =
38. 38.19 × 18 =
39. 39.39 × 15 =
40. 40.23 × 14 =

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