Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 420 · 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. 1.18 × 16 =
2. 2.36 × 14 =
3. 3.33 × 12 =
4. 4.47 × 18 =
5. 5.24 × 16 =
6. 6.31 × 16 =
7. 7.14 × 16 =
8. 8.19 × 15 =
9. 9.45 × 18 =
10. 10.19 × 14 =
11. 11.40 × 12 =
12. 12.29 × 24 =
13. 13.30 × 16 =
14. 14.26 × 24 =
15. 15.20 × 12 =
16. 16.11 × 16 =
17. 17.48 × 15 =
18. 18.37 × 16 =
19. 19.27 × 14 =
20. 20.22 × 15 =
21. 21.48 × 18 =
22. 22.35 × 14 =
23. 23.24 × 14 =
24. 24.35 × 16 =
25. 25.40 × 16 =
26. 26.32 × 12 =
27. 27.33 × 24 =
28. 28.11 × 24 =
29. 29.39 × 14 =
30. 30.38 × 16 =
31. 31.15 × 24 =
32. 32.25 × 18 =
33. 33.15 × 18 =
34. 34.23 × 16 =
35. 35.33 × 14 =
36. 36.21 × 15 =
37. 37.26 × 14 =
38. 38.25 × 15 =
39. 39.38 × 14 =
40. 40.43 × 15 =

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