Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 174 · 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. 2.33 × 14 =
3. 3.28 × 15 =
4. 4.46 × 18 =
5. 5.47 × 14 =
6. 6.23 × 16 =
7. 7.21 × 14 =
8. 8.16 × 16 =
9. 9.33 × 24 =
10. 10.11 × 15 =
11. 11.12 × 16 =
12. 12.47 × 16 =
13. 13.18 × 14 =
14. 14.31 × 12 =
15. 15.29 × 15 =
16. 16.35 × 24 =
17. 17.21 × 18 =
18. 18.22 × 14 =
19. 19.40 × 14 =
20. 20.23 × 18 =
21. 21.27 × 12 =
22. 22.17 × 16 =
23. 23.19 × 16 =
24. 24.32 × 14 =
25. 25.15 × 12 =
26. 26.31 × 15 =
27. 27.41 × 12 =
28. 28.16 × 24 =
29. 29.25 × 14 =
30. 30.40 × 15 =
31. 31.19 × 18 =
32. 32.17 × 18 =
33. 33.19 × 12 =
34. 34.37 × 14 =
35. 35.13 × 12 =
36. 36.48 × 24 =
37. 37.43 × 18 =
38. 38.21 × 12 =
39. 39.46 × 15 =
40. 40.29 × 16 =

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