Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 554 · 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. 1.26 × 14 =
2. 2.14 × 12 =
3. 3.39 × 16 =
4. 4.28 × 24 =
5. 5.12 × 18 =
6. 6.31 × 18 =
7. 7.39 × 12 =
8. 8.30 × 14 =
9. 9.24 × 16 =
10. 10.33 × 18 =
11. 11.17 × 12 =
12. 12.38 × 24 =
13. 13.16 × 18 =
14. 14.36 × 15 =
15. 15.24 × 18 =
16. 16.27 × 15 =
17. 17.35 × 24 =
18. 18.34 × 18 =
19. 19.18 × 16 =
20. 20.20 × 12 =
21. 21.38 × 14 =
22. 22.21 × 16 =
23. 23.41 × 12 =
24. 24.47 × 24 =
25. 25.17 × 24 =
26. 26.20 × 14 =
27. 27.44 × 15 =
28. 28.34 × 15 =
29. 29.27 × 16 =
30. 30.30 × 15 =
31. 31.24 × 24 =
32. 32.20 × 16 =
33. 33.42 × 12 =
34. 34.35 × 12 =
35. 35.39 × 15 =
36. 36.39 × 18 =
37. 37.12 × 12 =
38. 38.42 × 14 =
39. 39.25 × 12 =
40. 40.47 × 14 =

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