Let's begin by identifying key information given to us:
249 means Two hundreds, Four tens & Nine ones
201 means Two hundreds, Zero tens & One one
To obtain the sum of 249 & 201, we will sum the numbers having the same place value together, we have:
249 + 201 = Two hundreds plus Two hundreds, Four tens plus Zero tens & Nine ones plus One one
We have; Four hundreds, Four tens & Ten ones
"Ten ones" means that one is added to the digit in the tens place value. That is, Four tens plus One ten
Hence, the sum is given as:
Four hundreds, Five tens & Zero one