Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 611 · 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. 1.27 × 18 =
2. 2.24 × 14 =
3. 3.46 × 14 =
4. 4.11 × 24 =
5. 5.35 × 12 =
6. 6.29 × 15 =
7. 7.15 × 16 =
8. 8.21 × 16 =
9. 9.43 × 16 =
10. 10.33 × 12 =
11. 11.14 × 12 =
12. 12.19 × 24 =
13. 13.13 × 18 =
14. 14.30 × 24 =
15. 15.37 × 15 =
16. 16.22 × 16 =
17. 17.47 × 12 =
18. 18.38 × 12 =
19. 19.35 × 16 =
20. 20.47 × 15 =
21. 21.39 × 16 =
22. 22.22 × 12 =
23. 23.27 × 15 =
24. 24.46 × 12 =
25. 25.30 × 16 =
26. 26.15 × 12 =
27. 27.17 × 14 =
28. 28.11 × 18 =
29. 29.25 × 18 =
30. 30.47 × 18 =
31. 31.46 × 15 =
32. 32.25 × 12 =
33. 33.42 × 24 =
34. 34.44 × 14 =
35. 35.13 × 14 =
36. 36.20 × 15 =
37. 37.45 × 15 =
38. 38.35 × 24 =
39. 39.16 × 24 =
40. 40.35 × 14 =

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