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One example might be if you want to multiply somthing in your head. It can be easier to split the number into its components, ie (45 x 12) becomes (40+5) x (10+2) so from here you expand out and it becomes (400+80+50+10) which is 540. It can help in doing stuff in your head.

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Q: When do you need to use expanded form in daily life?
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