Aarti had ₹450. She spent $\frac{2}{9}$ of it on books and $\frac{1}{3}$ of it on stationery. How much money is left with her?

**Step 1**: write both in standard form (positive denominators).
**Step 2**: bring to a common denominator (the LCM of the two denominators).
**Step 3**: compare the numerators with their signs.

Example: compare −3/4 and −5/6. Common denominator = 12. −3/4 = −9/12; −5/6 = −10/12. With negatives, the smaller numerator is the smaller value. −10 < −9, so −5/6 < −3/4.