Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 130 · 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. 1.40 × 16 =
2. 2.29 × 18 =
3. 3.39 × 12 =
4. 4.16 × 14 =
5. 5.37 × 14 =
6. 6.34 × 24 =
7. 7.39 × 15 =
8. 8.36 × 15 =
9. 9.26 × 15 =
10. 10.42 × 12 =
11. 11.31 × 14 =
12. 12.29 × 12 =
13. 13.16 × 16 =
14. 14.17 × 14 =
15. 15.44 × 18 =
16. 16.41 × 24 =
17. 17.38 × 12 =
18. 18.15 × 18 =
19. 19.42 × 24 =
20. 20.12 × 14 =
21. 21.40 × 14 =
22. 22.34 × 14 =
23. 23.22 × 18 =
24. 24.46 × 24 =
25. 25.28 × 24 =
26. 26.26 × 12 =
27. 27.42 × 15 =
28. 28.43 × 24 =
29. 29.14 × 14 =
30. 30.45 × 12 =
31. 31.36 × 12 =
32. 32.47 × 12 =
33. 33.32 × 24 =
34. 34.25 × 24 =
35. 35.22 × 24 =
36. 36.11 × 14 =
37. 37.18 × 14 =
38. 38.46 × 12 =
39. 39.11 × 18 =
40. 40.14 × 24 =

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