Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 318 · 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 × 16 =
2. 2.39 × 16 =
3. 3.24 × 14 =
4. 4.30 × 12 =
5. 5.45 × 15 =
6. 6.27 × 18 =
7. 7.11 × 24 =
8. 8.13 × 15 =
9. 9.48 × 24 =
10. 10.41 × 18 =
11. 11.23 × 24 =
12. 12.42 × 16 =
13. 13.22 × 16 =
14. 14.44 × 12 =
15. 15.41 × 24 =
16. 16.18 × 15 =
17. 17.14 × 15 =
18. 18.14 × 18 =
19. 19.11 × 18 =
20. 20.42 × 12 =
21. 21.26 × 12 =
22. 22.39 × 24 =
23. 23.22 × 24 =
24. 24.49 × 15 =
25. 25.34 × 16 =
26. 26.30 × 14 =
27. 27.12 × 24 =
28. 28.19 × 16 =
29. 29.17 × 24 =
30. 30.13 × 12 =
31. 31.39 × 14 =
32. 32.37 × 16 =
33. 33.38 × 12 =
34. 34.41 × 12 =
35. 35.44 × 14 =
36. 36.30 × 15 =
37. 37.29 × 24 =
38. 38.35 × 24 =
39. 39.49 × 16 =
40. 40.17 × 14 =

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