Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 791 · 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. 1.43 × 24 =
2. 2.34 × 14 =
3. 3.39 × 14 =
4. 4.29 × 14 =
5. 5.19 × 18 =
6. 6.37 × 14 =
7. 7.42 × 16 =
8. 8.44 × 14 =
9. 9.36 × 18 =
10. 10.30 × 14 =
11. 11.13 × 15 =
12. 12.39 × 16 =
13. 13.30 × 18 =
14. 14.45 × 24 =
15. 15.47 × 16 =
16. 16.36 × 12 =
17. 17.27 × 24 =
18. 18.34 × 24 =
19. 19.42 × 12 =
20. 20.14 × 16 =
21. 21.22 × 12 =
22. 22.33 × 14 =
23. 23.17 × 15 =
24. 24.47 × 18 =
25. 25.12 × 12 =
26. 26.44 × 15 =
27. 27.34 × 15 =
28. 28.42 × 24 =
29. 29.11 × 24 =
30. 30.31 × 15 =
31. 31.18 × 18 =
32. 32.22 × 16 =
33. 33.32 × 15 =
34. 34.40 × 14 =
35. 35.29 × 12 =
36. 36.18 × 12 =
37. 37.31 × 12 =
38. 38.44 × 18 =
39. 39.37 × 18 =
40. 40.42 × 15 =

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