Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 707 · 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. 1.31 × 14 =
2. 2.38 × 24 =
3. 3.30 × 15 =
4. 4.47 × 18 =
5. 5.14 × 12 =
6. 6.34 × 12 =
7. 7.35 × 24 =
8. 8.23 × 18 =
9. 9.27 × 18 =
10. 10.41 × 14 =
11. 11.42 × 16 =
12. 12.30 × 16 =
13. 13.36 × 15 =
14. 14.17 × 14 =
15. 15.29 × 24 =
16. 16.29 × 12 =
17. 17.24 × 18 =
18. 18.16 × 24 =
19. 19.31 × 12 =
20. 20.41 × 18 =
21. 21.45 × 14 =
22. 22.40 × 14 =
23. 23.32 × 24 =
24. 24.25 × 12 =
25. 25.11 × 16 =
26. 26.15 × 12 =
27. 27.14 × 18 =
28. 28.18 × 12 =
29. 29.20 × 12 =
30. 30.15 × 24 =
31. 31.21 × 14 =
32. 32.12 × 12 =
33. 33.34 × 14 =
34. 34.19 × 16 =
35. 35.32 × 14 =
36. 36.45 × 24 =
37. 37.42 × 12 =
38. 38.16 × 14 =
39. 39.22 × 12 =
40. 40.34 × 18 =

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