Answer :

1/10 is equal to 100/1000, as that way, both the numerator and the denominator are multiplied by 100.
This works because the number multiplying the top and bottom are equal, therefore resulting in no net change.

1 X
------=-------
10 1000

Cross multiply
1x 1000 (=1000)
1000/10 (=100)
100

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