Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 375 · 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. 1.48 × 16 =
2. 2.20 × 18 =
3. 3.46 × 15 =
4. 4.33 × 14 =
5. 5.24 × 12 =
6. 6.23 × 18 =
7. 7.14 × 24 =
8. 8.28 × 24 =
9. 9.30 × 24 =
10. 10.20 × 24 =
11. 11.39 × 15 =
12. 12.11 × 24 =
13. 13.22 × 18 =
14. 14.36 × 18 =
15. 15.28 × 12 =
16. 16.39 × 24 =
17. 17.38 × 15 =
18. 18.11 × 14 =
19. 19.18 × 24 =
20. 20.25 × 24 =
21. 21.46 × 18 =
22. 22.12 × 16 =
23. 23.42 × 15 =
24. 24.40 × 12 =
25. 25.38 × 14 =
26. 26.41 × 15 =
27. 27.39 × 14 =
28. 28.14 × 16 =
29. 29.33 × 18 =
30. 30.49 × 12 =
31. 31.25 × 12 =
32. 32.34 × 18 =
33. 33.15 × 12 =
34. 34.23 × 12 =
35. 35.25 × 16 =
36. 36.39 × 12 =
37. 37.24 × 14 =
38. 38.40 × 24 =
39. 39.24 × 24 =
40. 40.41 × 18 =

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