Step: 1
2.215 + 4.617
[Original expression.]
Step: 2
The digit in the tenths place of 2.215 is 2, which is less than 5.
Step: 3
So, round the decimal 2.215 to the nearest whole number 2.
Step: 4
The digit in the tenths place of 4.617 is 6, which is greater than 5.
Step: 5
So, round the decimal 4.617 to the nearest whole number 5.
Step: 6
= 2 + 5
[Replace the decimals with their rounded values in the original expression.]
Step: 7
Step: 8
The estimated sum of the two decimals after rounding to the nearest whole numbers = 7.