Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 150 · 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. 1.30 × 14 =
2. 2.36 × 16 =
3. 3.32 × 12 =
4. 4.28 × 16 =
5. 5.35 × 18 =
6. 6.44 × 15 =
7. 7.37 × 24 =
8. 8.47 × 16 =
9. 9.43 × 15 =
10. 10.20 × 16 =
11. 11.27 × 16 =
12. 12.48 × 15 =
13. 13.37 × 12 =
14. 14.48 × 16 =
15. 15.29 × 12 =
16. 16.47 × 15 =
17. 17.11 × 15 =
18. 18.28 × 15 =
19. 19.14 × 15 =
20. 20.39 × 16 =
21. 21.34 × 16 =
22. 22.24 × 15 =
23. 23.13 × 18 =
24. 24.46 × 15 =
25. 25.25 × 15 =
26. 26.19 × 24 =
27. 27.29 × 16 =
28. 28.19 × 14 =
29. 29.45 × 15 =
30. 30.31 × 12 =
31. 31.23 × 16 =
32. 32.46 × 14 =
33. 33.29 × 14 =
34. 34.48 × 18 =
35. 35.46 × 18 =
36. 36.19 × 16 =
37. 37.17 × 15 =
38. 38.40 × 12 =
39. 39.45 × 14 =
40. 40.47 × 24 =

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