To add $$1.01, 257$$ and $$0.200$$
Convert the decimals into like decimal by adding zeros
Like decimals are $$1.010, 257.000$$ and $$0.200$$
$$1.010$$
$$257.000$$ $$+$$
$$0.200$$ $$+$$
____________
$$258.210$$
____________
Hence, the addition of the given decimal numbers is $$258.210$$