Informally Recording
Multiplication of Big Numbers

For more maths help & free games related to
this, visit: www.makemymat...
Before trying to record the multiplication of big numbers in a
formal way, you should try to record them informally by usi...
39 is partitioned as 30 and 9

39
39 is partitioned as 30 and 9

30
39

9
Then multiply the 30 x 7

30
39

9
Then multiply the 30 x 7

30
39

9

X7

210
Then multiply the 30 x 7
And the 9 x 7

30
39

9

X7

210
Then multiply the 30 x 7
And the 9 x 7

30
39

9

X7

X7

210

63
Finally, add the 2 answers
together

30
39

9

X7

X7

210

63
Finally, add the 2 answers
together

30
39

9

X7

X7

210
+

63

273
30
39

9

X7

X7

210
+

63

39 x 7 = 273

273
That’s it for now......

For more help with your maths, try
my book:
mastering multiplication tables
on amazon.com
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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

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