The answer doesn't exactly match the results of my calculation.
The answer and the results of my calculation are not exactly the same.
ーThe answer doesn't exactly match the results of my calculation.
「答えが私の計算結果とぴったり一致しない」
doesn't exactly match で「正確に一致しない」
results of my calculation で「私の計算の結果」
ーThe answer and the results of my calculation are not exactly the same.
「答えと私の計算結果が全く同じにならない」
are not exactly the same で「全く同じでない」
ご参考まで！
カナダ 
