Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 966 · 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. 1.38 × 16 =
2. 2.42 × 14 =
3. 3.41 × 14 =
4. 4.23 × 16 =
5. 5.19 × 15 =
6. 6.20 × 24 =
7. 7.43 × 15 =
8. 8.16 × 16 =
9. 9.22 × 16 =
10. 10.48 × 18 =
11. 11.45 × 15 =
12. 12.14 × 24 =
13. 13.42 × 16 =
14. 14.33 × 12 =
15. 15.35 × 12 =
16. 16.17 × 18 =
17. 17.12 × 15 =
18. 18.11 × 16 =
19. 19.18 × 15 =
20. 20.19 × 16 =
21. 21.23 × 18 =
22. 22.12 × 14 =
23. 23.36 × 12 =
24. 24.34 × 14 =
25. 25.24 × 24 =
26. 26.39 × 24 =
27. 27.42 × 18 =
28. 28.12 × 16 =
29. 29.20 × 18 =
30. 30.14 × 18 =
31. 31.34 × 24 =
32. 32.29 × 15 =
33. 33.15 × 15 =
34. 34.26 × 24 =
35. 35.21 × 12 =
36. 36.30 × 14 =
37. 37.13 × 12 =
38. 38.29 × 14 =
39. 39.17 × 12 =
40. 40.13 × 14 =

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