Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 626 · 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. 1.22 × 24 =
2. 2.36 × 15 =
3. 3.16 × 12 =
4. 4.12 × 12 =
5. 5.13 × 16 =
6. 6.42 × 18 =
7. 7.29 × 12 =
8. 8.21 × 12 =
9. 9.12 × 15 =
10. 10.25 × 14 =
11. 11.33 × 14 =
12. 12.13 × 14 =
13. 13.12 × 24 =
14. 14.12 × 16 =
15. 15.16 × 18 =
16. 16.27 × 12 =
17. 17.48 × 12 =
18. 18.27 × 18 =
19. 19.21 × 18 =
20. 20.29 × 24 =
21. 21.11 × 16 =
22. 22.43 × 18 =
23. 23.14 × 14 =
24. 24.40 × 18 =
25. 25.46 × 16 =
26. 26.25 × 16 =
27. 27.19 × 16 =
28. 28.41 × 18 =
29. 29.35 × 12 =
30. 30.14 × 16 =
31. 31.36 × 12 =
32. 32.28 × 15 =
33. 33.23 × 24 =
34. 34.21 × 15 =
35. 35.42 × 12 =
36. 36.14 × 18 =
37. 37.46 × 24 =
38. 38.27 × 24 =
39. 39.23 × 18 =
40. 40.13 × 24 =

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