Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 211 · 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. 2.42 × 15 =
3. 3.19 × 12 =
4. 4.35 × 12 =
5. 5.47 × 12 =
6. 6.48 × 18 =
7. 7.30 × 18 =
8. 8.35 × 24 =
9. 9.37 × 24 =
10. 10.26 × 18 =
11. 11.29 × 18 =
12. 12.12 × 18 =
13. 13.23 × 24 =
14. 14.44 × 16 =
15. 15.31 × 12 =
16. 16.27 × 18 =
17. 17.41 × 24 =
18. 18.19 × 14 =
19. 19.32 × 14 =
20. 20.39 × 12 =
21. 21.42 × 16 =
22. 22.16 × 24 =
23. 23.43 × 12 =
24. 24.13 × 14 =
25. 25.32 × 15 =
26. 26.41 × 12 =
27. 27.12 × 16 =
28. 28.16 × 16 =
29. 29.37 × 15 =
30. 30.41 × 18 =
31. 31.46 × 16 =
32. 32.17 × 16 =
33. 33.35 × 18 =
34. 34.47 × 14 =
35. 35.15 × 15 =
36. 36.15 × 14 =
37. 37.48 × 14 =
38. 38.21 × 16 =
39. 39.17 × 15 =
40. 40.43 × 15 =

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