Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 307 · 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. 2.47 × 12 =
3. 3.25 × 24 =
4. 4.23 × 16 =
5. 5.35 × 24 =
6. 6.33 × 12 =
7. 7.25 × 15 =
8. 8.17 × 24 =
9. 9.39 × 16 =
10. 10.34 × 14 =
11. 11.11 × 18 =
12. 12.20 × 14 =
13. 13.35 × 16 =
14. 14.14 × 15 =
15. 15.30 × 14 =
16. 16.21 × 16 =
17. 17.16 × 14 =
18. 18.27 × 12 =
19. 19.24 × 18 =
20. 20.35 × 15 =
21. 21.26 × 12 =
22. 22.15 × 16 =
23. 23.44 × 15 =
24. 24.36 × 24 =
25. 25.33 × 24 =
26. 26.32 × 16 =
27. 27.33 × 18 =
28. 28.46 × 16 =
29. 29.12 × 16 =
30. 30.22 × 15 =
31. 31.20 × 15 =
32. 32.21 × 12 =
33. 33.43 × 14 =
34. 34.49 × 12 =
35. 35.18 × 15 =
36. 36.22 × 12 =
37. 37.24 × 16 =
38. 38.14 × 14 =
39. 39.15 × 24 =
40. 40.32 × 24 =

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