Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 612 · 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. 1.30 × 14 =
2. 2.32 × 12 =
3. 3.29 × 24 =
4. 4.31 × 12 =
5. 5.45 × 14 =
6. 6.44 × 14 =
7. 7.45 × 15 =
8. 8.17 × 16 =
9. 9.20 × 15 =
10. 10.11 × 24 =
11. 11.22 × 14 =
12. 12.30 × 24 =
13. 13.43 × 18 =
14. 14.20 × 24 =
15. 15.29 × 14 =
16. 16.12 × 12 =
17. 17.18 × 12 =
18. 18.15 × 18 =
19. 19.34 × 14 =
20. 20.17 × 12 =
21. 21.24 × 24 =
22. 22.19 × 12 =
23. 23.27 × 12 =
24. 24.17 × 24 =
25. 25.23 × 18 =
26. 26.16 × 16 =
27. 27.21 × 15 =
28. 28.43 × 14 =
29. 29.31 × 24 =
30. 30.28 × 14 =
31. 31.22 × 16 =
32. 32.46 × 15 =
33. 33.46 × 18 =
34. 34.36 × 14 =
35. 35.19 × 16 =
36. 36.11 × 12 =
37. 37.24 × 14 =
38. 38.21 × 18 =
39. 39.43 × 16 =
40. 40.48 × 15 =

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