Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 836 · 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. 1.44 × 24 =
2. 2.45 × 18 =
3. 3.29 × 14 =
4. 4.14 × 15 =
5. 5.19 × 12 =
6. 6.36 × 14 =
7. 7.21 × 14 =
8. 8.41 × 14 =
9. 9.26 × 16 =
10. 10.18 × 15 =
11. 11.34 × 16 =
12. 12.30 × 12 =
13. 13.47 × 14 =
14. 14.37 × 12 =
15. 15.45 × 12 =
16. 16.49 × 18 =
17. 17.41 × 18 =
18. 18.20 × 18 =
19. 19.16 × 14 =
20. 20.33 × 16 =
21. 21.38 × 12 =
22. 22.43 × 18 =
23. 23.44 × 18 =
24. 24.25 × 12 =
25. 25.22 × 16 =
26. 26.13 × 16 =
27. 27.23 × 24 =
28. 28.11 × 16 =
29. 29.42 × 24 =
30. 30.24 × 12 =
31. 31.40 × 16 =
32. 32.20 × 24 =
33. 33.33 × 18 =
34. 34.43 × 12 =
35. 35.42 × 14 =
36. 36.29 × 12 =
37. 37.15 × 18 =
38. 38.13 × 24 =
39. 39.36 × 15 =
40. 40.16 × 18 =

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