The length of Ramanuja’s notebook is 19 cm 6 mm. What will be its length in cm?

Length of Ramanuja’s notebook = 19 cm 6 mm

We know that 10 mm = 1 cm

∴ 1 mm = $\frac{1}{10}$ cm

∴ 6 mm = $\frac{1}{10}\times 6=\frac{6}{10}=0.6$ cm

∴ 19 cm 6 mm = 19 cm + 0.6 cm = 19.6 cm

So, the length of Ramanuja’s notebook is 19.6 cm.