Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 354 · 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. 1.42 × 12 =
2. 2.29 × 14 =
3. 3.36 × 14 =
4. 4.45 × 15 =
5. 5.22 × 14 =
6. 6.21 × 18 =
7. 7.20 × 12 =
8. 8.32 × 18 =
9. 9.26 × 14 =
10. 10.32 × 24 =
11. 11.19 × 14 =
12. 12.43 × 14 =
13. 13.29 × 16 =
14. 14.43 × 12 =
15. 15.31 × 15 =
16. 16.31 × 14 =
17. 17.11 × 16 =
18. 18.44 × 16 =
19. 19.29 × 12 =
20. 20.20 × 18 =
21. 21.40 × 24 =
22. 22.46 × 24 =
23. 23.23 × 16 =
24. 24.16 × 24 =
25. 25.35 × 24 =
26. 26.41 × 24 =
27. 27.39 × 15 =
28. 28.14 × 24 =
29. 29.46 × 14 =
30. 30.15 × 14 =
31. 31.21 × 14 =
32. 32.16 × 14 =
33. 33.33 × 16 =
34. 34.20 × 15 =
35. 35.42 × 16 =
36. 36.12 × 16 =
37. 37.44 × 15 =
38. 38.22 × 15 =
39. 39.30 × 18 =
40. 40.32 × 12 =

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