Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 103 · 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. 1.29 × 15 =
2. 2.39 × 14 =
3. 3.36 × 14 =
4. 4.45 × 16 =
5. 5.46 × 16 =
6. 6.16 × 14 =
7. 7.44 × 24 =
8. 8.34 × 15 =
9. 9.18 × 14 =
10. 10.41 × 24 =
11. 11.14 × 16 =
12. 12.40 × 15 =
13. 13.12 × 24 =
14. 14.36 × 15 =
15. 15.30 × 24 =
16. 16.24 × 18 =
17. 17.39 × 18 =
18. 18.15 × 18 =
19. 19.29 × 16 =
20. 20.32 × 12 =
21. 21.34 × 14 =
22. 22.13 × 16 =
23. 23.40 × 16 =
24. 24.17 × 24 =
25. 25.18 × 18 =
26. 26.49 × 14 =
27. 27.14 × 12 =
28. 28.41 × 18 =
29. 29.43 × 16 =
30. 30.49 × 12 =
31. 31.35 × 12 =
32. 32.43 × 14 =
33. 33.49 × 16 =
34. 34.45 × 12 =
35. 35.33 × 12 =
36. 36.39 × 15 =
37. 37.11 × 18 =
38. 38.37 × 24 =
39. 39.32 × 15 =
40. 40.20 × 24 =

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