Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 481 · 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. 1.34 × 14 =
2. 2.32 × 14 =
3. 3.41 × 15 =
4. 4.46 × 15 =
5. 5.40 × 15 =
6. 6.14 × 16 =
7. 7.48 × 24 =
8. 8.27 × 16 =
9. 9.31 × 14 =
10. 10.25 × 14 =
11. 11.47 × 12 =
12. 12.11 × 14 =
13. 13.36 × 14 =
14. 14.11 × 24 =
15. 15.25 × 16 =
16. 16.25 × 15 =
17. 17.25 × 18 =
18. 18.21 × 12 =
19. 19.12 × 16 =
20. 20.44 × 15 =
21. 21.15 × 15 =
22. 22.13 × 16 =
23. 23.21 × 24 =
24. 24.31 × 16 =
25. 25.28 × 15 =
26. 26.40 × 14 =
27. 27.19 × 16 =
28. 28.12 × 14 =
29. 29.21 × 15 =
30. 30.27 × 12 =
31. 31.26 × 18 =
32. 32.39 × 24 =
33. 33.32 × 12 =
34. 34.44 × 16 =
35. 35.16 × 18 =
36. 36.31 × 12 =
37. 37.43 × 14 =
38. 38.48 × 15 =
39. 39.39 × 12 =
40. 40.28 × 12 =

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