We can start by converting both measurements to the same unit of length. Since 1 m is equal to 100 cm, 2 m is equal to 200 cm.
So, 70 cm is a fraction of 2 m can be written as:
70/200
To simplify this fraction, we can divide both the numerator and the denominator by their greatest common factor, which is 10.
70/200 = (70 ÷ 10) / (200 ÷ 10) = 7/20
Therefore, 70 cm is 7/20 of 2 m.