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The given number is a large number with 6 digits.

To change it into scientific notation, decimal is placed next to the first digit 5.

This means there are 5 decimal spaces on the left from the digit 5.

This makes the exponent of the 10 as 5.

Therefore 510000 can be written in scientific notation as 5.1 X 10

Hence 510000 = 5.1 X 10

The given number is a large number with 10 digits.

To change it into scientific notation decimal is placed next to the first digit 1.

This means there are 9 decimal spaces on the left from the digit 1.

This makes the exponent of the 10 as 9.

Therefore 1250000000 can be written in scientific notation as 1.25 X 10

Hence 1250000000 = 1.25 X 10