Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 40 · 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. 2.21 × 24 =
3. 3.41 × 18 =
4. 4.25 × 12 =
5. 5.28 × 14 =
6. 6.20 × 15 =
7. 7.34 × 18 =
8. 8.35 × 12 =
9. 9.47 × 12 =
10. 10.24 × 16 =
11. 11.36 × 15 =
12. 12.18 × 16 =
13. 13.15 × 15 =
14. 14.41 × 15 =
15. 15.31 × 16 =
16. 16.44 × 15 =
17. 17.13 × 12 =
18. 18.27 × 14 =
19. 19.13 × 16 =
20. 20.12 × 16 =
21. 21.33 × 16 =
22. 22.17 × 14 =
23. 23.26 × 12 =
24. 24.20 × 12 =
25. 25.31 × 24 =
26. 26.41 × 12 =
27. 27.49 × 24 =
28. 28.28 × 12 =
29. 29.44 × 16 =
30. 30.20 × 14 =
31. 31.32 × 14 =
32. 32.14 × 15 =
33. 33.43 × 12 =
34. 34.14 × 12 =
35. 35.35 × 24 =
36. 36.41 × 16 =
37. 37.29 × 12 =
38. 38.34 × 12 =
39. 39.13 × 14 =
40. 40.42 × 18 =

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