Q.7 Nandini’s house is \(\frac{9}{10} \) km from her school. She walked some distance and then took a bus for \(\frac{1}{2} \) km to reach the school. How far did she walk?

Distance of the school from house = \(\frac{9}{10} \) km
Distance she travelled by bus = \(\frac{1}{2} \) km
Distance walked by Nandini = Total distance of the school – Distance she travelled by bus
= \(\frac{9}{10} - \frac{1}{2} \)
= \(\frac{9}{10} - \frac{1×5}{2×5} \)
= \(\frac{9}{10} - \frac{5}{10} \)
= \(\frac{4}{10} \) = \(\frac{2}{5} \) km