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# 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
= $$\frac{9}{10} - \frac{1}{2}$$
= $$\frac{9}{10} - \frac{1×5}{2×5}$$
= $$\frac{9}{10} - \frac{5}{10}$$
= $$\frac{4}{10}$$ = $$\frac{2}{5}$$ km