Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 665 · 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. 1.40 × 16 =
2. 2.27 × 14 =
3. 3.41 × 16 =
4. 4.34 × 12 =
5. 5.37 × 24 =
6. 6.14 × 24 =
7. 7.48 × 16 =
8. 8.21 × 24 =
9. 9.36 × 14 =
10. 10.31 × 16 =
11. 11.19 × 12 =
12. 12.37 × 18 =
13. 13.39 × 15 =
14. 14.29 × 18 =
15. 15.17 × 18 =
16. 16.44 × 18 =
17. 17.13 × 24 =
18. 18.43 × 18 =
19. 19.15 × 15 =
20. 20.34 × 24 =
21. 21.25 × 24 =
22. 22.48 × 18 =
23. 23.45 × 16 =
24. 24.42 × 15 =
25. 25.12 × 18 =
26. 26.16 × 24 =
27. 27.18 × 24 =
28. 28.47 × 24 =
29. 29.40 × 12 =
30. 30.41 × 18 =
31. 31.33 × 15 =
32. 32.43 × 12 =
33. 33.22 × 12 =
34. 34.46 × 14 =
35. 35.17 × 16 =
36. 36.25 × 12 =
37. 37.26 × 18 =
38. 38.17 × 24 =
39. 39.20 × 16 =
40. 40.40 × 15 =

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