To solve this problem, let's convert the fraction in the mixed number to decimal:
- Step 1: Convert the fraction 21 to a decimal.
This is simply done by dividing 1 by 2:
21=1÷2=0.5.
- Step 2: Combine this result with the whole number part of the mixed number.
Thus, the mixed number 621 becomes:
6+0.5.
- Step 3: Add them together:
6+0.5=6.5.
Therefore, the decimal equivalent of the mixed number 621 is 6.5.