Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 80 · 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. 1.39 × 14 =
2. 2.37 × 15 =
3. 3.20 × 16 =
4. 4.27 × 12 =
5. 5.32 × 24 =
6. 6.35 × 18 =
7. 7.41 × 12 =
8. 8.48 × 14 =
9. 9.38 × 14 =
10. 10.14 × 18 =
11. 11.34 × 14 =
12. 12.39 × 18 =
13. 13.18 × 12 =
14. 14.39 × 16 =
15. 15.18 × 24 =
16. 16.35 × 12 =
17. 17.37 × 24 =
18. 18.11 × 16 =
19. 19.15 × 14 =
20. 20.45 × 16 =
21. 21.20 × 14 =
22. 22.46 × 12 =
23. 23.44 × 15 =
24. 24.29 × 15 =
25. 25.22 × 12 =
26. 26.32 × 16 =
27. 27.17 × 24 =
28. 28.28 × 18 =
29. 29.25 × 16 =
30. 30.28 × 24 =
31. 31.26 × 16 =
32. 32.16 × 14 =
33. 33.13 × 12 =
34. 34.38 × 12 =
35. 35.38 × 18 =
36. 36.13 × 24 =
37. 37.29 × 12 =
38. 38.21 × 18 =
39. 39.18 × 16 =
40. 40.42 × 15 =

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