Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 940 · 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. 1.37 × 15 =
2. 2.34 × 18 =
3. 3.44 × 18 =
4. 4.45 × 16 =
5. 5.13 × 24 =
6. 6.42 × 12 =
7. 7.47 × 14 =
8. 8.34 × 12 =
9. 9.15 × 18 =
10. 10.43 × 16 =
11. 11.40 × 15 =
12. 12.14 × 16 =
13. 13.32 × 12 =
14. 14.41 × 24 =
15. 15.31 × 12 =
16. 16.12 × 24 =
17. 17.43 × 14 =
18. 18.31 × 16 =
19. 19.44 × 12 =
20. 20.11 × 15 =
21. 21.12 × 14 =
22. 22.20 × 24 =
23. 23.34 × 14 =
24. 24.25 × 12 =
25. 25.42 × 24 =
26. 26.40 × 14 =
27. 27.12 × 12 =
28. 28.47 × 12 =
29. 29.19 × 24 =
30. 30.45 × 15 =
31. 31.39 × 16 =
32. 32.49 × 24 =
33. 33.11 × 12 =
34. 34.13 × 18 =
35. 35.28 × 14 =
36. 36.23 × 16 =
37. 37.13 × 14 =
38. 38.18 × 14 =
39. 39.49 × 14 =
40. 40.18 × 16 =

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