Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 3 · 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. 2.44 × 16 =
3. 3.30 × 12 =
4. 4.32 × 16 =
5. 5.15 × 15 =
6. 6.44 × 24 =
7. 7.39 × 24 =
8. 8.30 × 15 =
9. 9.35 × 15 =
10. 10.25 × 14 =
11. 11.20 × 18 =
12. 12.39 × 14 =
13. 13.40 × 15 =
14. 14.37 × 18 =
15. 15.35 × 14 =
16. 16.14 × 14 =
17. 17.17 × 15 =
18. 18.23 × 24 =
19. 19.42 × 18 =
20. 20.47 × 12 =
21. 21.28 × 15 =
22. 22.11 × 24 =
23. 23.20 × 14 =
24. 24.25 × 15 =
25. 25.28 × 24 =
26. 26.38 × 18 =
27. 27.48 × 12 =
28. 28.31 × 18 =
29. 29.24 × 16 =
30. 30.30 × 18 =
31. 31.34 × 18 =
32. 32.17 × 18 =
33. 33.42 × 24 =
34. 34.46 × 24 =
35. 35.43 × 18 =
36. 36.36 × 16 =
37. 37.45 × 14 =
38. 38.45 × 12 =
39. 39.42 × 12 =
40. 40.35 × 24 =

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