Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 683 · 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. 1.46 × 12 =
2. 2.45 × 18 =
3. 3.24 × 15 =
4. 4.35 × 12 =
5. 5.17 × 16 =
6. 6.14 × 16 =
7. 7.20 × 14 =
8. 8.38 × 24 =
9. 9.15 × 12 =
10. 10.13 × 15 =
11. 11.36 × 18 =
12. 12.35 × 24 =
13. 13.30 × 18 =
14. 14.34 × 14 =
15. 15.38 × 12 =
16. 16.32 × 15 =
17. 17.44 × 14 =
18. 18.31 × 14 =
19. 19.30 × 16 =
20. 20.16 × 24 =
21. 21.30 × 24 =
22. 22.40 × 15 =
23. 23.20 × 12 =
24. 24.16 × 12 =
25. 25.27 × 14 =
26. 26.12 × 14 =
27. 27.20 × 15 =
28. 28.11 × 16 =
29. 29.39 × 18 =
30. 30.21 × 16 =
31. 31.48 × 24 =
32. 32.39 × 24 =
33. 33.23 × 14 =
34. 34.30 × 12 =
35. 35.18 × 12 =
36. 36.31 × 12 =
37. 37.19 × 14 =
38. 38.30 × 14 =
39. 39.17 × 15 =
40. 40.18 × 14 =

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