Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 858 · 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. 1.18 × 12 =
2. 2.17 × 16 =
3. 3.39 × 14 =
4. 4.27 × 14 =
5. 5.17 × 24 =
6. 6.34 × 14 =
7. 7.15 × 12 =
8. 8.41 × 15 =
9. 9.33 × 14 =
10. 10.18 × 14 =
11. 11.35 × 18 =
12. 12.23 × 18 =
13. 13.42 × 12 =
14. 14.43 × 16 =
15. 15.36 × 16 =
16. 16.15 × 14 =
17. 17.35 × 14 =
18. 18.43 × 12 =
19. 19.39 × 24 =
20. 20.16 × 15 =
21. 21.47 × 15 =
22. 22.27 × 12 =
23. 23.23 × 24 =
24. 24.38 × 15 =
25. 25.39 × 12 =
26. 26.11 × 18 =
27. 27.34 × 24 =
28. 28.34 × 12 =
29. 29.22 × 18 =
30. 30.47 × 18 =
31. 31.38 × 14 =
32. 32.20 × 18 =
33. 33.36 × 14 =
34. 34.45 × 18 =
35. 35.33 × 12 =
36. 36.11 × 15 =
37. 37.15 × 24 =
38. 38.24 × 14 =
39. 39.44 × 12 =
40. 40.12 × 15 =

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