Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 135 · 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. 2.46 × 12 =
3. 3.14 × 15 =
4. 4.38 × 24 =
5. 5.47 × 18 =
6. 6.16 × 12 =
7. 7.26 × 14 =
8. 8.40 × 15 =
9. 9.26 × 18 =
10. 10.23 × 18 =
11. 11.30 × 14 =
12. 12.41 × 14 =
13. 13.45 × 24 =
14. 14.32 × 24 =
15. 15.28 × 24 =
16. 16.46 × 24 =
17. 17.24 × 16 =
18. 18.13 × 12 =
19. 19.27 × 14 =
20. 20.20 × 14 =
21. 21.21 × 14 =
22. 22.34 × 24 =
23. 23.47 × 14 =
24. 24.45 × 12 =
25. 25.27 × 12 =
26. 26.40 × 16 =
27. 27.22 × 24 =
28. 28.45 × 15 =
29. 29.43 × 15 =
30. 30.35 × 24 =
31. 31.41 × 24 =
32. 32.15 × 14 =
33. 33.35 × 18 =
34. 34.26 × 16 =
35. 35.29 × 24 =
36. 36.42 × 24 =
37. 37.44 × 15 =
38. 38.25 × 18 =
39. 39.38 × 12 =
40. 40.11 × 16 =

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