Solve Decimal Subtraction: 27.4 - 10.5 Step-by-Step

Let's solve the subtraction problem $27.4 - 10.5$ step-by-step:

Step 1: Align the numbers vertically by the decimal point:

$\begin{aligned} 27.4 \\ -10.5 \\ \hline \end{aligned}$

Step 2: Start subtracting from the rightmost digit, moving to the left.

• In the tenths column (4 - 5), we need to borrow from the ones column.

• Borrowing 1 from the ones column changes 27.4 to 26.14:

$\begin{aligned} 26.14 \\ -10.50 \\ \hline \end{aligned}$

• Now subtract the tenths: 14 - 5 = 9.

• Next, subtract the ones column: 6 - 0 = 6.

• Finally, subtract the tens column: 2 - 1 = 1.

Therefore, the result of $27.4 - 10.5$ is $16.9$.

The correct answer is $\boxed{16.9}$.