Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 646 · 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. 1.16 × 12 =
2. 2.34 × 24 =
3. 3.46 × 14 =
4. 4.44 × 12 =
5. 5.17 × 16 =
6. 6.17 × 15 =
7. 7.30 × 15 =
8. 8.30 × 16 =
9. 9.46 × 24 =
10. 10.21 × 15 =
11. 11.16 × 24 =
12. 12.38 × 16 =
13. 13.12 × 15 =
14. 14.16 × 14 =
15. 15.37 × 12 =
16. 16.49 × 15 =
17. 17.19 × 16 =
18. 18.11 × 24 =
19. 19.32 × 18 =
20. 20.23 × 12 =
21. 21.35 × 18 =
22. 22.35 × 12 =
23. 23.24 × 12 =
24. 24.28 × 12 =
25. 25.48 × 15 =
26. 26.27 × 15 =
27. 27.29 × 24 =
28. 28.32 × 14 =
29. 29.28 × 14 =
30. 30.11 × 16 =
31. 31.47 × 18 =
32. 32.17 × 12 =
33. 33.39 × 18 =
34. 34.36 × 12 =
35. 35.45 × 14 =
36. 36.19 × 14 =
37. 37.36 × 15 =
38. 38.40 × 16 =
39. 39.19 × 12 =
40. 40.19 × 18 =

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