Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 738 · 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. 1.41 × 16 =
2. 2.39 × 18 =
3. 3.44 × 12 =
4. 4.29 × 15 =
5. 5.22 × 24 =
6. 6.34 × 16 =
7. 7.42 × 12 =
8. 8.27 × 18 =
9. 9.16 × 15 =
10. 10.24 × 16 =
11. 11.45 × 18 =
12. 12.12 × 24 =
13. 13.46 × 16 =
14. 14.28 × 24 =
15. 15.48 × 14 =
16. 16.37 × 14 =
17. 17.47 × 14 =
18. 18.17 × 12 =
19. 19.16 × 24 =
20. 20.42 × 18 =
21. 21.33 × 18 =
22. 22.32 × 24 =
23. 23.36 × 12 =
24. 24.47 × 12 =
25. 25.48 × 12 =
26. 26.40 × 14 =
27. 27.40 × 15 =
28. 28.38 × 14 =
29. 29.22 × 12 =
30. 30.11 × 16 =
31. 31.37 × 12 =
32. 32.35 × 12 =
33. 33.29 × 14 =
34. 34.47 × 18 =
35. 35.17 × 24 =
36. 36.45 × 14 =
37. 37.24 × 24 =
38. 38.39 × 15 =
39. 39.39 × 12 =
40. 40.15 × 16 =

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