Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 288 · 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. 1.44 × 16 =
2. 2.15 × 12 =
3. 3.32 × 14 =
4. 4.28 × 12 =
5. 5.40 × 18 =
6. 6.28 × 15 =
7. 7.14 × 14 =
8. 8.29 × 16 =
9. 9.36 × 15 =
10. 10.39 × 15 =
11. 11.49 × 12 =
12. 12.25 × 12 =
13. 13.26 × 12 =
14. 14.22 × 24 =
15. 15.11 × 15 =
16. 16.31 × 15 =
17. 17.46 × 18 =
18. 18.41 × 16 =
19. 19.15 × 16 =
20. 20.42 × 24 =
21. 21.14 × 16 =
22. 22.18 × 24 =
23. 23.15 × 14 =
24. 24.21 × 12 =
25. 25.44 × 24 =
26. 26.28 × 14 =
27. 27.21 × 14 =
28. 28.29 × 15 =
29. 29.18 × 12 =
30. 30.11 × 16 =
31. 31.49 × 24 =
32. 32.22 × 16 =
33. 33.11 × 12 =
34. 34.35 × 18 =
35. 35.31 × 12 =
36. 36.39 × 16 =
37. 37.40 × 14 =
38. 38.18 × 18 =
39. 39.37 × 15 =
40. 40.12 × 12 =

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