Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 357 · 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. 1.31 × 12 =
2. 2.12 × 15 =
3. 3.47 × 12 =
4. 4.32 × 15 =
5. 5.30 × 15 =
6. 6.24 × 15 =
7. 7.37 × 24 =
8. 8.29 × 18 =
9. 9.41 × 14 =
10. 10.16 × 18 =
11. 11.22 × 15 =
12. 12.27 × 12 =
13. 13.47 × 16 =
14. 14.14 × 15 =
15. 15.47 × 24 =
16. 16.14 × 24 =
17. 17.30 × 14 =
18. 18.48 × 18 =
19. 19.33 × 18 =
20. 20.25 × 12 =
21. 21.34 × 18 =
22. 22.15 × 24 =
23. 23.46 × 15 =
24. 24.26 × 16 =
25. 25.38 × 24 =
26. 26.46 × 12 =
27. 27.26 × 14 =
28. 28.46 × 24 =
29. 29.32 × 14 =
30. 30.40 × 14 =
31. 31.19 × 14 =
32. 32.13 × 12 =
33. 33.34 × 12 =
34. 34.40 × 15 =
35. 35.30 × 24 =
36. 36.33 × 24 =
37. 37.35 × 18 =
38. 38.37 × 16 =
39. 39.14 × 16 =
40. 40.42 × 14 =

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