Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 159 · 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. 1.14 × 12 =
2. 2.41 × 15 =
3. 3.22 × 24 =
4. 4.12 × 18 =
5. 5.21 × 16 =
6. 6.17 × 24 =
7. 7.27 × 18 =
8. 8.18 × 14 =
9. 9.35 × 18 =
10. 10.14 × 14 =
11. 11.49 × 14 =
12. 12.29 × 14 =
13. 13.47 × 14 =
14. 14.38 × 18 =
15. 15.35 × 24 =
16. 16.12 × 16 =
17. 17.17 × 15 =
18. 18.15 × 24 =
19. 19.25 × 12 =
20. 20.44 × 14 =
21. 21.23 × 18 =
22. 22.34 × 12 =
23. 23.23 × 12 =
24. 24.45 × 18 =
25. 25.35 × 16 =
26. 26.48 × 16 =
27. 27.28 × 18 =
28. 28.26 × 24 =
29. 29.43 × 16 =
30. 30.13 × 18 =
31. 31.13 × 12 =
32. 32.42 × 24 =
33. 33.47 × 18 =
34. 34.23 × 14 =
35. 35.49 × 12 =
36. 36.18 × 15 =
37. 37.24 × 12 =
38. 38.46 × 18 =
39. 39.12 × 15 =
40. 40.43 × 14 =

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