Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 189 · 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. 1.34 × 12 =
2. 2.36 × 14 =
3. 3.20 × 14 =
4. 4.33 × 14 =
5. 5.46 × 24 =
6. 6.23 × 14 =
7. 7.42 × 15 =
8. 8.36 × 15 =
9. 9.20 × 16 =
10. 10.22 × 12 =
11. 11.32 × 14 =
12. 12.25 × 14 =
13. 13.35 × 18 =
14. 14.17 × 14 =
15. 15.24 × 18 =
16. 16.23 × 18 =
17. 17.49 × 16 =
18. 18.17 × 16 =
19. 19.26 × 16 =
20. 20.34 × 18 =
21. 21.34 × 15 =
22. 22.41 × 24 =
23. 23.30 × 18 =
24. 24.38 × 16 =
25. 25.34 × 14 =
26. 26.31 × 15 =
27. 27.30 × 14 =
28. 28.35 × 24 =
29. 29.11 × 24 =
30. 30.36 × 18 =
31. 31.29 × 12 =
32. 32.28 × 12 =
33. 33.16 × 24 =
34. 34.46 × 18 =
35. 35.33 × 24 =
36. 36.24 × 15 =
37. 37.23 × 16 =
38. 38.15 × 12 =
39. 39.47 × 12 =
40. 40.26 × 24 =

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