Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 677 · 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. 1.20 × 24 =
2. 2.15 × 16 =
3. 3.38 × 15 =
4. 4.45 × 18 =
5. 5.37 × 12 =
6. 6.33 × 14 =
7. 7.30 × 18 =
8. 8.16 × 14 =
9. 9.39 × 12 =
10. 10.36 × 12 =
11. 11.16 × 18 =
12. 12.40 × 24 =
13. 13.32 × 15 =
14. 14.20 × 14 =
15. 15.46 × 12 =
16. 16.22 × 24 =
17. 17.13 × 16 =
18. 18.20 × 15 =
19. 19.21 × 16 =
20. 20.36 × 14 =
21. 21.45 × 12 =
22. 22.34 × 15 =
23. 23.28 × 14 =
24. 24.42 × 12 =
25. 25.38 × 16 =
26. 26.44 × 12 =
27. 27.11 × 15 =
28. 28.38 × 14 =
29. 29.43 × 12 =
30. 30.27 × 15 =
31. 31.21 × 24 =
32. 32.12 × 14 =
33. 33.39 × 15 =
34. 34.15 × 14 =
35. 35.42 × 16 =
36. 36.23 × 18 =
37. 37.43 × 16 =
38. 38.35 × 14 =
39. 39.40 × 12 =
40. 40.45 × 14 =

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