Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 895 · 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. 1.21 × 24 =
2. 2.24 × 14 =
3. 3.22 × 18 =
4. 4.43 × 16 =
5. 5.36 × 16 =
6. 6.16 × 15 =
7. 7.43 × 15 =
8. 8.20 × 18 =
9. 9.35 × 15 =
10. 10.33 × 12 =
11. 11.20 × 24 =
12. 12.26 × 24 =
13. 13.47 × 14 =
14. 14.46 × 18 =
15. 15.36 × 18 =
16. 16.19 × 16 =
17. 17.39 × 24 =
18. 18.34 × 18 =
19. 19.31 × 18 =
20. 20.29 × 24 =
21. 21.20 × 14 =
22. 22.25 × 14 =
23. 23.18 × 15 =
24. 24.11 × 15 =
25. 25.13 × 14 =
26. 26.22 × 14 =
27. 27.17 × 16 =
28. 28.14 × 15 =
29. 29.45 × 18 =
30. 30.45 × 16 =
31. 31.17 × 18 =
32. 32.35 × 16 =
33. 33.39 × 14 =
34. 34.15 × 14 =
35. 35.26 × 12 =
36. 36.38 × 12 =
37. 37.35 × 18 =
38. 38.21 × 16 =
39. 39.27 × 18 =
40. 40.15 × 18 =

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