Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 674 · 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. 1.39 × 18 =
2. 2.16 × 12 =
3. 3.38 × 24 =
4. 4.37 × 14 =
5. 5.41 × 14 =
6. 6.31 × 14 =
7. 7.20 × 18 =
8. 8.39 × 16 =
9. 9.34 × 12 =
10. 10.18 × 12 =
11. 11.14 × 12 =
12. 12.23 × 15 =
13. 13.20 × 24 =
14. 14.26 × 15 =
15. 15.45 × 14 =
16. 16.25 × 15 =
17. 17.18 × 18 =
18. 18.11 × 24 =
19. 19.41 × 18 =
20. 20.28 × 18 =
21. 21.21 × 16 =
22. 22.12 × 12 =
23. 23.32 × 12 =
24. 24.44 × 14 =
25. 25.11 × 15 =
26. 26.32 × 15 =
27. 27.20 × 15 =
28. 28.38 × 14 =
29. 29.35 × 24 =
30. 30.40 × 14 =
31. 31.42 × 24 =
32. 32.48 × 15 =
33. 33.30 × 24 =
34. 34.22 × 16 =
35. 35.43 × 12 =
36. 36.29 × 14 =
37. 37.25 × 14 =
38. 38.47 × 14 =
39. 39.24 × 18 =
40. 40.45 × 12 =

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