Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 746 · 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. 1.19 × 16 =
2. 2.46 × 18 =
3. 3.42 × 18 =
4. 4.31 × 12 =
5. 5.18 × 18 =
6. 6.46 × 12 =
7. 7.47 × 16 =
8. 8.42 × 14 =
9. 9.16 × 12 =
10. 10.12 × 16 =
11. 11.32 × 18 =
12. 12.27 × 18 =
13. 13.11 × 16 =
14. 14.33 × 14 =
15. 15.44 × 12 =
16. 16.32 × 12 =
17. 17.30 × 24 =
18. 18.25 × 24 =
19. 19.24 × 18 =
20. 20.13 × 16 =
21. 21.29 × 12 =
22. 22.48 × 16 =
23. 23.32 × 15 =
24. 24.46 × 15 =
25. 25.21 × 14 =
26. 26.13 × 12 =
27. 27.43 × 14 =
28. 28.19 × 15 =
29. 29.21 × 24 =
30. 30.39 × 15 =
31. 31.41 × 24 =
32. 32.15 × 16 =
33. 33.25 × 18 =
34. 34.34 × 15 =
35. 35.48 × 14 =
36. 36.23 × 24 =
37. 37.14 × 16 =
38. 38.45 × 24 =
39. 39.14 × 14 =
40. 40.13 × 15 =

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