Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 937 · 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. 1.49 × 16 =
2. 2.43 × 16 =
3. 3.42 × 24 =
4. 4.29 × 14 =
5. 5.11 × 14 =
6. 6.12 × 18 =
7. 7.21 × 12 =
8. 8.49 × 12 =
9. 9.24 × 12 =
10. 10.13 × 16 =
11. 11.13 × 12 =
12. 12.44 × 18 =
13. 13.33 × 16 =
14. 14.43 × 12 =
15. 15.15 × 18 =
16. 16.39 × 15 =
17. 17.23 × 15 =
18. 18.20 × 16 =
19. 19.14 × 12 =
20. 20.15 × 12 =
21. 21.36 × 15 =
22. 22.48 × 24 =
23. 23.23 × 14 =
24. 24.34 × 24 =
25. 25.20 × 15 =
26. 26.34 × 16 =
27. 27.49 × 15 =
28. 28.11 × 12 =
29. 29.45 × 16 =
30. 30.44 × 12 =
31. 31.22 × 18 =
32. 32.25 × 14 =
33. 33.19 × 12 =
34. 34.37 × 16 =
35. 35.14 × 15 =
36. 36.21 × 24 =
37. 37.38 × 14 =
38. 38.18 × 14 =
39. 39.29 × 12 =
40. 40.13 × 18 =

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