Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 574 · 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. 1.28 × 14 =
2. 2.31 × 16 =
3. 3.44 × 16 =
4. 4.37 × 14 =
5. 5.21 × 16 =
6. 6.41 × 18 =
7. 7.43 × 14 =
8. 8.17 × 18 =
9. 9.36 × 15 =
10. 10.44 × 15 =
11. 11.12 × 24 =
12. 12.31 × 12 =
13. 13.48 × 12 =
14. 14.33 × 12 =
15. 15.22 × 15 =
16. 16.46 × 14 =
17. 17.16 × 14 =
18. 18.11 × 12 =
19. 19.36 × 16 =
20. 20.14 × 24 =
21. 21.14 × 16 =
22. 22.25 × 14 =
23. 23.12 × 12 =
24. 24.23 × 14 =
25. 25.42 × 18 =
26. 26.40 × 14 =
27. 27.45 × 14 =
28. 28.20 × 12 =
29. 29.46 × 24 =
30. 30.13 × 12 =
31. 31.39 × 18 =
32. 32.35 × 12 =
33. 33.26 × 16 =
34. 34.27 × 24 =
35. 35.20 × 16 =
36. 36.20 × 15 =
37. 37.40 × 24 =
38. 38.25 × 12 =
39. 39.43 × 24 =
40. 40.15 × 15 =

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