Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 870 · 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. 1.45 × 18 =
2. 2.30 × 18 =
3. 3.47 × 12 =
4. 4.20 × 15 =
5. 5.46 × 12 =
6. 6.19 × 24 =
7. 7.40 × 15 =
8. 8.17 × 12 =
9. 9.49 × 15 =
10. 10.19 × 16 =
11. 11.41 × 12 =
12. 12.25 × 14 =
13. 13.43 × 12 =
14. 14.13 × 14 =
15. 15.45 × 24 =
16. 16.14 × 24 =
17. 17.20 × 16 =
18. 18.31 × 15 =
19. 19.47 × 14 =
20. 20.28 × 24 =
21. 21.48 × 14 =
22. 22.11 × 12 =
23. 23.49 × 14 =
24. 24.37 × 15 =
25. 25.13 × 18 =
26. 26.14 × 15 =
27. 27.24 × 18 =
28. 28.35 × 12 =
29. 29.34 × 16 =
30. 30.15 × 14 =
31. 31.19 × 18 =
32. 32.44 × 18 =
33. 33.23 × 15 =
34. 34.34 × 24 =
35. 35.40 × 24 =
36. 36.36 × 24 =
37. 37.48 × 18 =
38. 38.46 × 18 =
39. 39.14 × 14 =
40. 40.13 × 12 =

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