Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 426 · 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. 1.19 × 12 =
2. 2.31 × 18 =
3. 3.35 × 16 =
4. 4.33 × 24 =
5. 5.48 × 24 =
6. 6.40 × 14 =
7. 7.37 × 12 =
8. 8.17 × 24 =
9. 9.48 × 12 =
10. 10.11 × 16 =
11. 11.23 × 15 =
12. 12.26 × 15 =
13. 13.19 × 14 =
14. 14.12 × 16 =
15. 15.42 × 12 =
16. 16.33 × 18 =
17. 17.48 × 18 =
18. 18.17 × 16 =
19. 19.20 × 16 =
20. 20.27 × 15 =
21. 21.49 × 15 =
22. 22.30 × 14 =
23. 23.43 × 12 =
24. 24.39 × 16 =
25. 25.15 × 14 =
26. 26.16 × 14 =
27. 27.47 × 18 =
28. 28.26 × 24 =
29. 29.17 × 18 =
30. 30.20 × 15 =
31. 31.35 × 18 =
32. 32.36 × 16 =
33. 33.17 × 14 =
34. 34.20 × 18 =
35. 35.18 × 15 =
36. 36.39 × 15 =
37. 37.34 × 14 =
38. 38.28 × 15 =
39. 39.18 × 24 =
40. 40.48 × 14 =

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