Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 395 · 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. 1.23 × 14 =
2. 2.11 × 14 =
3. 3.44 × 12 =
4. 4.14 × 18 =
5. 5.35 × 14 =
6. 6.21 × 24 =
7. 7.12 × 24 =
8. 8.45 × 18 =
9. 9.16 × 18 =
10. 10.30 × 14 =
11. 11.46 × 14 =
12. 12.28 × 14 =
13. 13.27 × 12 =
14. 14.32 × 14 =
15. 15.13 × 12 =
16. 16.34 × 14 =
17. 17.27 × 14 =
18. 18.42 × 16 =
19. 19.22 × 14 =
20. 20.21 × 14 =
21. 21.17 × 15 =
22. 22.22 × 18 =
23. 23.29 × 16 =
24. 24.45 × 14 =
25. 25.16 × 16 =
26. 26.25 × 14 =
27. 27.11 × 24 =
28. 28.43 × 15 =
29. 29.31 × 24 =
30. 30.34 × 12 =
31. 31.21 × 15 =
32. 32.19 × 15 =
33. 33.15 × 24 =
34. 34.32 × 24 =
35. 35.20 × 14 =
36. 36.15 × 16 =
37. 37.46 × 18 =
38. 38.33 × 14 =
39. 39.24 × 16 =
40. 40.22 × 12 =

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