Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 51 · 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. 1.40 × 12 =
2. 2.11 × 16 =
3. 3.23 × 15 =
4. 4.17 × 14 =
5. 5.48 × 12 =
6. 6.15 × 24 =
7. 7.47 × 24 =
8. 8.43 × 16 =
9. 9.24 × 14 =
10. 10.20 × 24 =
11. 11.40 × 16 =
12. 12.25 × 16 =
13. 13.32 × 16 =
14. 14.33 × 18 =
15. 15.18 × 18 =
16. 16.44 × 14 =
17. 17.11 × 15 =
18. 18.27 × 16 =
19. 19.36 × 15 =
20. 20.29 × 15 =
21. 21.30 × 15 =
22. 22.37 × 18 =
23. 23.35 × 24 =
24. 24.36 × 12 =
25. 25.14 × 15 =
26. 26.19 × 14 =
27. 27.42 × 24 =
28. 28.44 × 24 =
29. 29.12 × 24 =
30. 30.13 × 16 =
31. 31.18 × 24 =
32. 32.16 × 24 =
33. 33.34 × 15 =
34. 34.15 × 16 =
35. 35.48 × 15 =
36. 36.25 × 14 =
37. 37.25 × 18 =
38. 38.20 × 16 =
39. 39.45 × 16 =
40. 40.46 × 16 =

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