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# Multiplying Using Informal Jottings

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### Multiplying Using Informal Jottings

1. 1. Informally Recording Multiplication of Big Numbers For more maths help & free games related to this, visit: www.makemymathsbetter.com
2. 2. Before trying to record the multiplication of big numbers in a formal way, you should try to record them informally by using jottings. Most methods for doing this usually involve partitioning the larger number e.g. 39 x 7
3. 3. 39 is partitioned as 30 and 9 39
4. 4. 39 is partitioned as 30 and 9 30 39 9
5. 5. Then multiply the 30 x 7 30 39 9
6. 6. Then multiply the 30 x 7 30 39 9 X7 210
7. 7. Then multiply the 30 x 7 And the 9 x 7 30 39 9 X7 210
8. 8. Then multiply the 30 x 7 And the 9 x 7 30 39 9 X7 X7 210 63
9. 9. Finally, add the 2 answers together 30 39 9 X7 X7 210 63
10. 10. Finally, add the 2 answers together 30 39 9 X7 X7 210 + 63 273
11. 11. 30 39 9 X7 X7 210 + 63 39 x 7 = 273 273
12. 12. That’s it for now...... For more help with your maths, try my book: mastering multiplication tables on amazon.com