Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 997 · 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. 1.24 × 24 =
2. 2.35 × 14 =
3. 3.17 × 15 =
4. 4.37 × 15 =
5. 5.33 × 14 =
6. 6.11 × 12 =
7. 7.12 × 24 =
8. 8.26 × 12 =
9. 9.32 × 12 =
10. 10.30 × 18 =
11. 11.46 × 24 =
12. 12.46 × 16 =
13. 13.25 × 24 =
14. 14.45 × 12 =
15. 15.21 × 18 =
16. 16.32 × 14 =
17. 17.15 × 15 =
18. 18.24 × 15 =
19. 19.30 × 12 =
20. 20.18 × 15 =
21. 21.44 × 18 =
22. 22.34 × 14 =
23. 23.11 × 18 =
24. 24.47 × 15 =
25. 25.16 × 16 =
26. 26.30 × 24 =
27. 27.11 × 14 =
28. 28.21 × 14 =
29. 29.27 × 15 =
30. 30.32 × 18 =
31. 31.14 × 16 =
32. 32.34 × 18 =
33. 33.30 × 15 =
34. 34.28 × 12 =
35. 35.37 × 12 =
36. 36.21 × 16 =
37. 37.38 × 24 =
38. 38.13 × 16 =
39. 39.43 × 24 =
40. 40.49 × 14 =

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