Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 29 · 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. 1.17 × 16 =
2. 2.16 × 12 =
3. 3.43 × 16 =
4. 4.43 × 18 =
5. 5.28 × 16 =
6. 6.34 × 15 =
7. 7.38 × 15 =
8. 8.47 × 15 =
9. 9.31 × 12 =
10. 10.11 × 14 =
11. 11.35 × 18 =
12. 12.18 × 14 =
13. 13.34 × 24 =
14. 14.30 × 12 =
15. 15.49 × 16 =
16. 16.21 × 12 =
17. 17.48 × 16 =
18. 18.13 × 18 =
19. 19.21 × 14 =
20. 20.24 × 14 =
21. 21.39 × 24 =
22. 22.18 × 24 =
23. 23.14 × 15 =
24. 24.29 × 18 =
25. 25.27 × 14 =
26. 26.38 × 14 =
27. 27.17 × 12 =
28. 28.45 × 12 =
29. 29.45 × 24 =
30. 30.16 × 15 =
31. 31.48 × 12 =
32. 32.12 × 15 =
33. 33.36 × 14 =
34. 34.14 × 18 =
35. 35.22 × 24 =
36. 36.25 × 18 =
37. 37.40 × 18 =
38. 38.49 × 18 =
39. 39.22 × 12 =
40. 40.43 × 14 =

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