Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 510 · 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 × 12 =
2. 2.34 × 18 =
3. 3.44 × 18 =
4. 4.21 × 16 =
5. 5.43 × 16 =
6. 6.15 × 14 =
7. 7.32 × 14 =
8. 8.46 × 18 =
9. 9.11 × 14 =
10. 10.41 × 12 =
11. 11.40 × 15 =
12. 12.21 × 24 =
13. 13.35 × 24 =
14. 14.30 × 14 =
15. 15.14 × 14 =
16. 16.40 × 12 =
17. 17.48 × 12 =
18. 18.11 × 16 =
19. 19.45 × 24 =
20. 20.45 × 15 =
21. 21.27 × 12 =
22. 22.13 × 14 =
23. 23.12 × 14 =
24. 24.13 × 24 =
25. 25.19 × 18 =
26. 26.15 × 16 =
27. 27.16 × 18 =
28. 28.35 × 12 =
29. 29.37 × 16 =
30. 30.49 × 24 =
31. 31.17 × 24 =
32. 32.42 × 15 =
33. 33.19 × 24 =
34. 34.12 × 16 =
35. 35.14 × 16 =
36. 36.32 × 24 =
37. 37.14 × 15 =
38. 38.20 × 12 =
39. 39.42 × 24 =
40. 40.47 × 24 =

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