Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 916 · 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. 1.46 × 18 =
2. 2.16 × 16 =
3. 3.16 × 12 =
4. 4.39 × 15 =
5. 5.21 × 24 =
6. 6.26 × 14 =
7. 7.14 × 16 =
8. 8.14 × 24 =
9. 9.41 × 15 =
10. 10.18 × 12 =
11. 11.31 × 16 =
12. 12.34 × 14 =
13. 13.40 × 15 =
14. 14.28 × 15 =
15. 15.48 × 15 =
16. 16.45 × 12 =
17. 17.44 × 12 =
18. 18.29 × 12 =
19. 19.19 × 15 =
20. 20.36 × 12 =
21. 21.38 × 14 =
22. 22.17 × 16 =
23. 23.49 × 15 =
24. 24.41 × 24 =
25. 25.48 × 12 =
26. 26.45 × 24 =
27. 27.11 × 16 =
28. 28.22 × 15 =
29. 29.47 × 12 =
30. 30.30 × 12 =
31. 31.16 × 15 =
32. 32.16 × 24 =
33. 33.40 × 24 =
34. 34.15 × 16 =
35. 35.32 × 16 =
36. 36.25 × 14 =
37. 37.28 × 16 =
38. 38.19 × 16 =
39. 39.42 × 12 =
40. 40.17 × 12 =

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