Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 841 · 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. 1.30 × 14 =
2. 2.29 × 14 =
3. 3.14 × 18 =
4. 4.18 × 14 =
5. 5.13 × 12 =
6. 6.27 × 15 =
7. 7.11 × 18 =
8. 8.43 × 14 =
9. 9.22 × 14 =
10. 10.12 × 16 =
11. 11.33 × 16 =
12. 12.12 × 24 =
13. 13.31 × 15 =
14. 14.38 × 24 =
15. 15.38 × 14 =
16. 16.13 × 14 =
17. 17.41 × 12 =
18. 18.29 × 12 =
19. 19.29 × 18 =
20. 20.21 × 18 =
21. 21.16 × 24 =
22. 22.33 × 12 =
23. 23.36 × 18 =
24. 24.38 × 12 =
25. 25.30 × 12 =
26. 26.18 × 16 =
27. 27.27 × 12 =
28. 28.45 × 15 =
29. 29.11 × 14 =
30. 30.42 × 18 =
31. 31.21 × 15 =
32. 32.16 × 15 =
33. 33.39 × 16 =
34. 34.12 × 12 =
35. 35.25 × 16 =
36. 36.48 × 14 =
37. 37.36 × 24 =
38. 38.33 × 14 =
39. 39.13 × 18 =
40. 40.38 × 16 =

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