Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 463 · 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. 1.39 × 15 =
2. 2.17 × 24 =
3. 3.17 × 18 =
4. 4.18 × 14 =
5. 5.18 × 15 =
6. 6.44 × 14 =
7. 7.34 × 24 =
8. 8.22 × 24 =
9. 9.32 × 24 =
10. 10.33 × 18 =
11. 11.36 × 15 =
12. 12.48 × 24 =
13. 13.36 × 14 =
14. 14.39 × 24 =
15. 15.40 × 16 =
16. 16.26 × 24 =
17. 17.12 × 14 =
18. 18.35 × 16 =
19. 19.22 × 14 =
20. 20.37 × 24 =
21. 21.13 × 16 =
22. 22.25 × 24 =
23. 23.43 × 18 =
24. 24.26 × 16 =
25. 25.28 × 18 =
26. 26.21 × 18 =
27. 27.20 × 15 =
28. 28.31 × 16 =
29. 29.35 × 24 =
30. 30.23 × 16 =
31. 31.25 × 18 =
32. 32.31 × 18 =
33. 33.23 × 18 =
34. 34.49 × 14 =
35. 35.42 × 15 =
36. 36.13 × 24 =
37. 37.42 × 14 =
38. 38.46 × 14 =
39. 39.46 × 18 =
40. 40.27 × 16 =

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