Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 802 · 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. 1.37 × 16 =
2. 2.14 × 15 =
3. 3.30 × 14 =
4. 4.15 × 14 =
5. 5.11 × 15 =
6. 6.17 × 15 =
7. 7.39 × 15 =
8. 8.44 × 18 =
9. 9.23 × 24 =
10. 10.20 × 18 =
11. 11.43 × 14 =
12. 12.24 × 12 =
13. 13.46 × 15 =
14. 14.34 × 12 =
15. 15.37 × 15 =
16. 16.29 × 15 =
17. 17.21 × 14 =
18. 18.16 × 14 =
19. 19.39 × 18 =
20. 20.37 × 24 =
21. 21.30 × 18 =
22. 22.35 × 24 =
23. 23.30 × 12 =
24. 24.34 × 18 =
25. 25.38 × 16 =
26. 26.28 × 16 =
27. 27.15 × 16 =
28. 28.32 × 18 =
29. 29.33 × 15 =
30. 30.17 × 14 =
31. 31.27 × 18 =
32. 32.22 × 15 =
33. 33.12 × 16 =
34. 34.45 × 12 =
35. 35.13 × 14 =
36. 36.16 × 12 =
37. 37.48 × 15 =
38. 38.22 × 14 =
39. 39.38 × 12 =
40. 40.31 × 15 =

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