Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 850 · 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. 1.31 × 24 =
2. 2.41 × 12 =
3. 3.19 × 18 =
4. 4.34 × 12 =
5. 5.23 × 24 =
6. 6.36 × 12 =
7. 7.16 × 15 =
8. 8.46 × 15 =
9. 9.38 × 15 =
10. 10.40 × 14 =
11. 11.34 × 18 =
12. 12.42 × 18 =
13. 13.28 × 16 =
14. 14.12 × 16 =
15. 15.25 × 15 =
16. 16.12 × 15 =
17. 17.24 × 18 =
18. 18.35 × 24 =
19. 19.24 × 24 =
20. 20.33 × 18 =
21. 21.13 × 18 =
22. 22.36 × 18 =
23. 23.40 × 12 =
24. 24.12 × 14 =
25. 25.11 × 15 =
26. 26.33 × 15 =
27. 27.34 × 15 =
28. 28.31 × 16 =
29. 29.37 × 12 =
30. 30.48 × 12 =
31. 31.27 × 14 =
32. 32.46 × 16 =
33. 33.35 × 15 =
34. 34.34 × 24 =
35. 35.13 × 15 =
36. 36.32 × 16 =
37. 37.40 × 15 =
38. 38.47 × 14 =
39. 39.45 × 15 =
40. 40.23 × 14 =

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