Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 961 · 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. 1.45 × 15 =
2. 2.16 × 14 =
3. 3.47 × 15 =
4. 4.41 × 24 =
5. 5.16 × 24 =
6. 6.45 × 24 =
7. 7.33 × 16 =
8. 8.18 × 12 =
9. 9.33 × 18 =
10. 10.31 × 12 =
11. 11.44 × 16 =
12. 12.11 × 18 =
13. 13.38 × 14 =
14. 14.24 × 16 =
15. 15.11 × 16 =
16. 16.49 × 12 =
17. 17.42 × 24 =
18. 18.27 × 18 =
19. 19.48 × 24 =
20. 20.26 × 12 =
21. 21.16 × 15 =
22. 22.25 × 18 =
23. 23.28 × 12 =
24. 24.33 × 12 =
25. 25.15 × 18 =
26. 26.21 × 12 =
27. 27.21 × 14 =
28. 28.34 × 24 =
29. 29.29 × 14 =
30. 30.43 × 24 =
31. 31.47 × 12 =
32. 32.11 × 12 =
33. 33.15 × 14 =
34. 34.29 × 18 =
35. 35.21 × 24 =
36. 36.40 × 24 =
37. 37.44 × 12 =
38. 38.20 × 15 =
39. 39.35 × 24 =
40. 40.20 × 12 =

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