Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 906 · 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. 1.17 × 14 =
2. 2.20 × 16 =
3. 3.20 × 15 =
4. 4.35 × 12 =
5. 5.12 × 14 =
6. 6.27 × 24 =
7. 7.49 × 14 =
8. 8.14 × 15 =
9. 9.22 × 15 =
10. 10.22 × 24 =
11. 11.44 × 16 =
12. 12.30 × 16 =
13. 13.15 × 24 =
14. 14.13 × 12 =
15. 15.42 × 16 =
16. 16.27 × 15 =
17. 17.15 × 18 =
18. 18.19 × 16 =
19. 19.32 × 16 =
20. 20.18 × 24 =
21. 21.45 × 12 =
22. 22.18 × 14 =
23. 23.31 × 12 =
24. 24.17 × 12 =
25. 25.16 × 18 =
26. 26.48 × 16 =
27. 27.18 × 15 =
28. 28.48 × 24 =
29. 29.13 × 24 =
30. 30.11 × 16 =
31. 31.46 × 15 =
32. 32.45 × 18 =
33. 33.14 × 16 =
34. 34.25 × 24 =
35. 35.24 × 24 =
36. 36.19 × 24 =
37. 37.48 × 15 =
38. 38.20 × 12 =
39. 39.13 × 18 =
40. 40.43 × 14 =

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