Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 818 · 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. 1.21 × 14 =
2. 2.49 × 12 =
3. 3.40 × 24 =
4. 4.25 × 12 =
5. 5.42 × 12 =
6. 6.19 × 16 =
7. 7.11 × 24 =
8. 8.36 × 12 =
9. 9.47 × 16 =
10. 10.13 × 15 =
11. 11.12 × 14 =
12. 12.23 × 15 =
13. 13.18 × 12 =
14. 14.27 × 16 =
15. 15.33 × 15 =
16. 16.29 × 24 =
17. 17.11 × 14 =
18. 18.13 × 16 =
19. 19.25 × 14 =
20. 20.29 × 18 =
21. 21.27 × 14 =
22. 22.31 × 16 =
23. 23.37 × 14 =
24. 24.21 × 15 =
25. 25.11 × 18 =
26. 26.42 × 15 =
27. 27.36 × 15 =
28. 28.21 × 24 =
29. 29.19 × 18 =
30. 30.23 × 24 =
31. 31.15 × 15 =
32. 32.12 × 16 =
33. 33.45 × 18 =
34. 34.16 × 14 =
35. 35.16 × 12 =
36. 36.41 × 12 =
37. 37.33 × 24 =
38. 38.18 × 24 =
39. 39.32 × 14 =
40. 40.35 × 12 =

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