Step-by-step explanation:
each shelf is 2.475 m long
now we are asking for the total length of 100 of these shelves.
total length = 100 × 2.475 = 247.5 m
you remember, with every power of 10 multiplied with a decimal number the decimal point moves one position to the right. if we run out of provided digits, 0s are being added on the right side.
so, for 100 the decimal point moves 2 positions to the right, as 100 = 10².
for 1000 it would be 3 positions, as 1000 = 10³.
and so on.
and with the division by every power of 10 the decimal point moves one position to the left (filling in 0s between the decimal point and the actual digits, if we are running out of provided digits).
