Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 251 · 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. 1.13 × 14 =
2. 2.46 × 16 =
3. 3.38 × 14 =
4. 4.41 × 16 =
5. 5.35 × 15 =
6. 6.14 × 15 =
7. 7.30 × 14 =
8. 8.36 × 14 =
9. 9.38 × 12 =
10. 10.17 × 16 =
11. 11.14 × 12 =
12. 12.22 × 18 =
13. 13.34 × 18 =
14. 14.12 × 16 =
15. 15.37 × 12 =
16. 16.41 × 12 =
17. 17.16 × 16 =
18. 18.41 × 18 =
19. 19.22 × 12 =
20. 20.18 × 12 =
21. 21.12 × 15 =
22. 22.15 × 14 =
23. 23.44 × 24 =
24. 24.17 × 14 =
25. 25.12 × 12 =
26. 26.32 × 12 =
27. 27.43 × 16 =
28. 28.32 × 18 =
29. 29.48 × 15 =
30. 30.11 × 15 =
31. 31.28 × 18 =
32. 32.43 × 15 =
33. 33.49 × 24 =
34. 34.11 × 16 =
35. 35.22 × 14 =
36. 36.37 × 16 =
37. 37.28 × 12 =
38. 38.12 × 18 =
39. 39.20 × 12 =
40. 40.37 × 14 =

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