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Find 3.3 - 1.27.
Align the decimal places and place values.
3.3
-1.27
Add zeros, if needed.
3.30
-1.27
Add or subtract, regroup if necessary.
When finding a sum, add and then rename.
When finding a difference, rename and then subtract.
Estimate to see if your answer is reasonable.
A good estimate for this problem is 3 - 1 = 2, which is close to 2.03.
Our answer seems reasonable.