Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 207 · 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. 1.46 × 14 =
2. 2.46 × 18 =
3. 3.39 × 24 =
4. 4.13 × 12 =
5. 5.40 × 18 =
6. 6.15 × 24 =
7. 7.20 × 18 =
8. 8.39 × 14 =
9. 9.37 × 14 =
10. 10.15 × 12 =
11. 11.43 × 16 =
12. 12.13 × 14 =
13. 13.19 × 14 =
14. 14.31 × 14 =
15. 15.37 × 24 =
16. 16.24 × 15 =
17. 17.37 × 12 =
18. 18.24 × 12 =
19. 19.29 × 18 =
20. 20.11 × 14 =
21. 21.28 × 24 =
22. 22.19 × 18 =
23. 23.44 × 16 =
24. 24.29 × 24 =
25. 25.12 × 15 =
26. 26.45 × 14 =
27. 27.44 × 14 =
28. 28.47 × 12 =
29. 29.18 × 12 =
30. 30.32 × 15 =
31. 31.12 × 12 =
32. 32.43 × 24 =
33. 33.32 × 14 =
34. 34.45 × 24 =
35. 35.19 × 15 =
36. 36.36 × 14 =
37. 37.33 × 15 =
38. 38.20 × 24 =
39. 39.30 × 12 =
40. 40.15 × 15 =

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