Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 308 · 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. 1.40 × 12 =
2. 2.40 × 14 =
3. 3.30 × 15 =
4. 4.40 × 24 =
5. 5.11 × 24 =
6. 6.31 × 16 =
7. 7.18 × 24 =
8. 8.17 × 12 =
9. 9.45 × 15 =
10. 10.36 × 16 =
11. 11.41 × 24 =
12. 12.34 × 14 =
13. 13.16 × 12 =
14. 14.22 × 18 =
15. 15.31 × 18 =
16. 16.21 × 24 =
17. 17.45 × 16 =
18. 18.13 × 24 =
19. 19.25 × 14 =
20. 20.42 × 16 =
21. 21.18 × 14 =
22. 22.12 × 15 =
23. 23.20 × 14 =
24. 24.24 × 15 =
25. 25.34 × 12 =
26. 26.16 × 24 =
27. 27.49 × 15 =
28. 28.42 × 15 =
29. 29.30 × 24 =
30. 30.23 × 15 =
31. 31.27 × 16 =
32. 32.40 × 15 =
33. 33.24 × 14 =
34. 34.14 × 12 =
35. 35.35 × 12 =
36. 36.25 × 15 =
37. 37.23 × 16 =
38. 38.16 × 15 =
39. 39.47 × 14 =
40. 40.30 × 18 =

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