Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 361 · 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. 1.39 × 12 =
2. 2.43 × 18 =
3. 3.46 × 12 =
4. 4.36 × 18 =
5. 5.44 × 24 =
6. 6.46 × 15 =
7. 7.23 × 18 =
8. 8.48 × 16 =
9. 9.26 × 16 =
10. 10.30 × 12 =
11. 11.35 × 16 =
12. 12.30 × 15 =
13. 13.40 × 16 =
14. 14.23 × 16 =
15. 15.32 × 12 =
16. 16.20 × 14 =
17. 17.17 × 15 =
18. 18.15 × 18 =
19. 19.31 × 12 =
20. 20.48 × 18 =
21. 21.47 × 12 =
22. 22.46 × 24 =
23. 23.39 × 14 =
24. 24.45 × 12 =
25. 25.19 × 15 =
26. 26.45 × 15 =
27. 27.21 × 16 =
28. 28.11 × 15 =
29. 29.16 × 24 =
30. 30.44 × 14 =
31. 31.34 × 24 =
32. 32.12 × 16 =
33. 33.45 × 14 =
34. 34.34 × 15 =
35. 35.12 × 18 =
36. 36.28 × 14 =
37. 37.25 × 14 =
38. 38.42 × 15 =
39. 39.43 × 12 =
40. 40.23 × 14 =

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