Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 631 · 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. 1.16 × 14 =
2. 2.47 × 12 =
3. 3.41 × 18 =
4. 4.44 × 12 =
5. 5.30 × 12 =
6. 6.48 × 12 =
7. 7.17 × 16 =
8. 8.34 × 12 =
9. 9.46 × 18 =
10. 10.13 × 12 =
11. 11.17 × 12 =
12. 12.47 × 14 =
13. 13.13 × 14 =
14. 14.37 × 24 =
15. 15.33 × 15 =
16. 16.25 × 18 =
17. 17.29 × 12 =
18. 18.35 × 16 =
19. 19.49 × 15 =
20. 20.15 × 12 =
21. 21.13 × 24 =
22. 22.22 × 24 =
23. 23.36 × 14 =
24. 24.23 × 14 =
25. 25.12 × 24 =
26. 26.24 × 15 =
27. 27.32 × 24 =
28. 28.29 × 16 =
29. 29.43 × 18 =
30. 30.14 × 18 =
31. 31.49 × 18 =
32. 32.22 × 18 =
33. 33.21 × 18 =
34. 34.43 × 24 =
35. 35.24 × 18 =
36. 36.20 × 14 =
37. 37.39 × 24 =
38. 38.44 × 24 =
39. 39.44 × 15 =
40. 40.36 × 18 =

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