Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 429 · 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. 1.48 × 18 =
2. 2.19 × 12 =
3. 3.22 × 24 =
4. 4.16 × 12 =
5. 5.25 × 15 =
6. 6.49 × 12 =
7. 7.29 × 15 =
8. 8.24 × 14 =
9. 9.45 × 16 =
10. 10.30 × 12 =
11. 11.19 × 18 =
12. 12.22 × 18 =
13. 13.46 × 24 =
14. 14.30 × 14 =
15. 15.24 × 12 =
16. 16.18 × 16 =
17. 17.32 × 24 =
18. 18.40 × 24 =
19. 19.42 × 12 =
20. 20.30 × 15 =
21. 21.20 × 15 =
22. 22.12 × 14 =
23. 23.18 × 14 =
24. 24.32 × 16 =
25. 25.27 × 14 =
26. 26.21 × 16 =
27. 27.22 × 14 =
28. 28.14 × 24 =
29. 29.19 × 14 =
30. 30.28 × 15 =
31. 31.20 × 12 =
32. 32.33 × 14 =
33. 33.27 × 15 =
34. 34.23 × 14 =
35. 35.31 × 16 =
36. 36.41 × 18 =
37. 37.13 × 24 =
38. 38.46 × 15 =
39. 39.45 × 24 =
40. 40.12 × 15 =

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