Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 877 · 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. 1.38 × 14 =
2. 2.19 × 16 =
3. 3.42 × 12 =
4. 4.20 × 12 =
5. 5.35 × 24 =
6. 6.30 × 15 =
7. 7.31 × 16 =
8. 8.44 × 24 =
9. 9.22 × 24 =
10. 10.28 × 12 =
11. 11.31 × 18 =
12. 12.25 × 16 =
13. 13.36 × 16 =
14. 14.15 × 14 =
15. 15.22 × 12 =
16. 16.25 × 14 =
17. 17.21 × 12 =
18. 18.16 × 18 =
19. 19.23 × 18 =
20. 20.15 × 24 =
21. 21.45 × 15 =
22. 22.11 × 12 =
23. 23.39 × 16 =
24. 24.48 × 15 =
25. 25.42 × 16 =
26. 26.19 × 14 =
27. 27.15 × 12 =
28. 28.11 × 15 =
29. 29.21 × 16 =
30. 30.38 × 16 =
31. 31.49 × 24 =
32. 32.37 × 15 =
33. 33.11 × 24 =
34. 34.42 × 15 =
35. 35.39 × 24 =
36. 36.44 × 12 =
37. 37.48 × 24 =
38. 38.24 × 16 =
39. 39.43 × 16 =
40. 40.29 × 16 =

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