She goes to school and back everyday. She covers the distance twice (to school and back home) every day.Total distance covered each day
=2×2345m=4690mCalculations
Kilo means 1000 , hence divide the meters by 1000 to obtain the kilometers.
4690m==4.69kmCalculations
1000=10×10×10=1034690m===4690×10−3Note: From law of indices
a−b==10−3Change the whole number
times10−n form to decimal by moving the decimal point by the value of the power to the left.
4690=4690.0 (Every whole number has .0 which isn't written)
4690×10−3=4..0×10−3=4.69kmIn summary, any time you are dividing by
1n0s, you move the decimal point of the number you are dividing
n times to the left.
Where
n0s means number of zeros after
1In the above example 1000 has three (3) zeros hence we have to move the decimal point of 4690.0 three times to the left.