Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 333 · 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. 1.32 × 14 =
2. 2.33 × 14 =
3. 3.11 × 14 =
4. 4.47 × 18 =
5. 5.36 × 24 =
6. 6.15 × 16 =
7. 7.18 × 15 =
8. 8.11 × 16 =
9. 9.18 × 16 =
10. 10.38 × 24 =
11. 11.21 × 24 =
12. 12.15 × 24 =
13. 13.49 × 14 =
14. 14.23 × 12 =
15. 15.22 × 15 =
16. 16.27 × 12 =
17. 17.24 × 15 =
18. 18.19 × 16 =
19. 19.30 × 18 =
20. 20.38 × 12 =
21. 21.46 × 24 =
22. 22.42 × 15 =
23. 23.45 × 12 =
24. 24.23 × 24 =
25. 25.31 × 16 =
26. 26.33 × 15 =
27. 27.14 × 16 =
28. 28.22 × 14 =
29. 29.23 × 18 =
30. 30.42 × 16 =
31. 31.38 × 15 =
32. 32.48 × 14 =
33. 33.40 × 14 =
34. 34.28 × 15 =
35. 35.47 × 14 =
36. 36.15 × 18 =
37. 37.49 × 12 =
38. 38.17 × 12 =
39. 39.35 × 12 =
40. 40.19 × 12 =

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