Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 476 · 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. 1.37 × 24 =
2. 2.29 × 12 =
3. 3.17 × 14 =
4. 4.18 × 18 =
5. 5.21 × 16 =
6. 6.33 × 15 =
7. 7.30 × 18 =
8. 8.23 × 14 =
9. 9.29 × 24 =
10. 10.43 × 18 =
11. 11.27 × 18 =
12. 12.41 × 14 =
13. 13.21 × 12 =
14. 14.36 × 24 =
15. 15.36 × 14 =
16. 16.49 × 16 =
17. 17.36 × 16 =
18. 18.21 × 15 =
19. 19.25 × 14 =
20. 20.19 × 15 =
21. 21.33 × 14 =
22. 22.36 × 12 =
23. 23.42 × 18 =
24. 24.29 × 18 =
25. 25.15 × 16 =
26. 26.30 × 15 =
27. 27.39 × 15 =
28. 28.19 × 14 =
29. 29.18 × 24 =
30. 30.43 × 16 =
31. 31.38 × 15 =
32. 32.16 × 24 =
33. 33.35 × 16 =
34. 34.28 × 18 =
35. 35.13 × 15 =
36. 36.41 × 15 =
37. 37.47 × 16 =
38. 38.26 × 14 =
39. 39.21 × 14 =
40. 40.45 × 15 =

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