Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 688 · 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. 1.17 × 12 =
2. 2.38 × 12 =
3. 3.38 × 14 =
4. 4.11 × 14 =
5. 5.18 × 24 =
6. 6.17 × 24 =
7. 7.37 × 12 =
8. 8.12 × 15 =
9. 9.34 × 24 =
10. 10.28 × 18 =
11. 11.40 × 15 =
12. 12.38 × 16 =
13. 13.37 × 15 =
14. 14.25 × 24 =
15. 15.48 × 24 =
16. 16.36 × 14 =
17. 17.28 × 15 =
18. 18.17 × 14 =
19. 19.32 × 14 =
20. 20.21 × 12 =
21. 21.25 × 14 =
22. 22.29 × 24 =
23. 23.32 × 18 =
24. 24.33 × 18 =
25. 25.26 × 12 =
26. 26.44 × 18 =
27. 27.15 × 14 =
28. 28.23 × 18 =
29. 29.18 × 15 =
30. 30.39 × 16 =
31. 31.34 × 15 =
32. 32.35 × 18 =
33. 33.44 × 16 =
34. 34.36 × 24 =
35. 35.13 × 24 =
36. 36.33 × 15 =
37. 37.31 × 14 =
38. 38.29 × 12 =
39. 39.27 × 12 =
40. 40.23 × 12 =

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