Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 290 · 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. 1.11 × 16 =
2. 2.13 × 16 =
3. 3.49 × 16 =
4. 4.35 × 18 =
5. 5.47 × 15 =
6. 6.17 × 12 =
7. 7.37 × 18 =
8. 8.18 × 12 =
9. 9.18 × 24 =
10. 10.16 × 14 =
11. 11.16 × 15 =
12. 12.46 × 18 =
13. 13.47 × 12 =
14. 14.25 × 18 =
15. 15.25 × 15 =
16. 16.18 × 16 =
17. 17.34 × 24 =
18. 18.46 × 12 =
19. 19.23 × 12 =
20. 20.11 × 15 =
21. 21.24 × 12 =
22. 22.13 × 14 =
23. 23.17 × 24 =
24. 24.13 × 24 =
25. 25.27 × 18 =
26. 26.40 × 18 =
27. 27.27 × 14 =
28. 28.11 × 18 =
29. 29.15 × 12 =
30. 30.18 × 15 =
31. 31.13 × 15 =
32. 32.35 × 24 =
33. 33.13 × 12 =
34. 34.24 × 15 =
35. 35.15 × 15 =
36. 36.48 × 14 =
37. 37.37 × 24 =
38. 38.47 × 14 =
39. 39.40 × 14 =
40. 40.30 × 18 =

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