Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 259 · 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. 1.41 × 16 =
2. 2.12 × 15 =
3. 3.43 × 14 =
4. 4.22 × 12 =
5. 5.31 × 16 =
6. 6.35 × 14 =
7. 7.31 × 15 =
8. 8.37 × 24 =
9. 9.14 × 15 =
10. 10.16 × 15 =
11. 11.14 × 14 =
12. 12.16 × 14 =
13. 13.18 × 14 =
14. 14.45 × 24 =
15. 15.47 × 15 =
16. 16.28 × 12 =
17. 17.45 × 16 =
18. 18.44 × 18 =
19. 19.42 × 18 =
20. 20.37 × 18 =
21. 21.35 × 15 =
22. 22.42 × 15 =
23. 23.16 × 16 =
24. 24.46 × 24 =
25. 25.15 × 15 =
26. 26.18 × 15 =
27. 27.11 × 18 =
28. 28.36 × 18 =
29. 29.13 × 24 =
30. 30.40 × 24 =
31. 31.39 × 18 =
32. 32.35 × 12 =
33. 33.31 × 18 =
34. 34.27 × 12 =
35. 35.19 × 12 =
36. 36.23 × 12 =
37. 37.15 × 16 =
38. 38.48 × 16 =
39. 39.24 × 14 =
40. 40.17 × 12 =

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