Why should you multiply ones before multiplying by tens?

[LANE]

Why should you multiply ones before multiplying by tens?
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Edited by stapel -- Reason for edit: putting question inside post

 

[Denis]

What's your question?

 

[stapel]

What's your question?

It was hidden in the subject line. The post has been edited for clarity.

Why should you multiply ones before multiplying by tens?

No particular reason. When multiplying in your head, it's often easier to go the other way 'round, actually.

Eliz.