Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 558 · 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. 1.36 × 14 =
2. 2.36 × 16 =
3. 3.17 × 14 =
4. 4.45 × 14 =
5. 5.45 × 12 =
6. 6.44 × 12 =
7. 7.18 × 16 =
8. 8.46 × 12 =
9. 9.49 × 18 =
10. 10.39 × 18 =
11. 11.24 × 12 =
12. 12.24 × 14 =
13. 13.11 × 15 =
14. 14.29 × 18 =
15. 15.48 × 14 =
16. 16.41 × 24 =
17. 17.46 × 16 =
18. 18.26 × 12 =
19. 19.21 × 16 =
20. 20.43 × 15 =
21. 21.47 × 18 =
22. 22.14 × 12 =
23. 23.39 × 24 =
24. 24.20 × 16 =
25. 25.26 × 18 =
26. 26.24 × 24 =
27. 27.37 × 15 =
28. 28.30 × 14 =
29. 29.39 × 16 =
30. 30.49 × 12 =
31. 31.22 × 12 =
32. 32.16 × 12 =
33. 33.19 × 12 =
34. 34.30 × 12 =
35. 35.34 × 12 =
36. 36.45 × 24 =
37. 37.27 × 14 =
38. 38.18 × 24 =
39. 39.17 × 12 =
40. 40.37 × 18 =

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