NCERT Exemplar Solutions
Class 6 - Mathematics - Unit 4: Fractions & Decimals - Problems and Solutions

Question 103

We have a mixed number: \(11\dfrac{9}{80}\,\text{cm}\).

1. Keep the denominator the same: \(80\).
2. Multiply the whole number by the denominator:
   \(11 \times 80 = 880\).
3. Add the numerator to this result:
   \(880 + 9 = 889\).
4. Write this sum over the original denominator:
   \(\dfrac{889}{80}\).
5. Add the unit: \(\dfrac{889}{80}\,\text{cm}\).

So, \(11\dfrac{9}{80}\,\text{cm} = \dfrac{889}{80}\,\text{cm}\).