Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 62 · 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. 2.25 × 15 =
3. 3.22 × 16 =
4. 4.26 × 14 =
5. 5.17 × 14 =
6. 6.48 × 15 =
7. 7.22 × 15 =
8. 8.13 × 16 =
9. 9.21 × 14 =
10. 10.18 × 18 =
11. 11.17 × 24 =
12. 12.22 × 14 =
13. 13.18 × 12 =
14. 14.31 × 18 =
15. 15.25 × 16 =
16. 16.28 × 12 =
17. 17.44 × 18 =
18. 18.14 × 15 =
19. 19.31 × 24 =
20. 20.45 × 15 =
21. 21.26 × 12 =
22. 22.21 × 12 =
23. 23.45 × 16 =
24. 24.27 × 24 =
25. 25.24 × 16 =
26. 26.24 × 14 =
27. 27.14 × 24 =
28. 28.20 × 14 =
29. 29.48 × 12 =
30. 30.42 × 24 =
31. 31.29 × 16 =
32. 32.31 × 15 =
33. 33.20 × 16 =
34. 34.14 × 18 =
35. 35.11 × 14 =
36. 36.42 × 15 =
37. 37.15 × 15 =
38. 38.32 × 15 =
39. 39.20 × 15 =
40. 40.28 × 18 =

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