Like Decimals are those decimals which have same number of decimal places.

Or we can say that:

Decimals having same number of decimal places are known as Like Decimals

Example - Decimals 56.8, 7.1, 36.1, 36.9, 0.8, 241.2 all are Like Decimals because:
56.8 has one decimal place i.e. digit 8
7.1 has one decimal place i.e. digit 1
36.1 has one decimal place i.e. digit 1
36.9 has one decimal place i.e. digit 9
0.8 has one decimal place i.e. digit 8
241.2 has one decimal place i.e. digit 2

So, above all Decimals have only one decimal place and hence they are known as Like Decimals.

Similarly, Decimals 54.32, 0.82, 4.78, 919.32 and 14.93 all have two decimal places and hence they are also Like Decimals