Solve Decimal Subtraction: Calculate 15.8 - 3.5

Video Solution

Solution Steps

00:00 Solve

00:03 We will use long subtraction for calculation

00:11 We will place the decimal point in the appropriate position

00:14 We will start by subtracting the corresponding smallest digits

00:17 We will place and continue to subtract and calculate

00:28 And this is the solution to the question

Step-by-Step Solution

To solve the problem $15.8 - 3.5$ , we will perform decimal subtraction:

Step 1: Align the decimal places.
Write the numbers so their decimal points are lined up:
$\quad 15.8\\ - \, 3.5\\ --------$
Step 2: Subtract the numbers column by column.
- Start from the rightmost digit (tenths place), $8 - 5 = 3$ . Write $3$ under the line in the tenths place.
- Move to the next left column (ones place), $5 - 3 = 2$ . Write $2$ in the ones place.
- The digit in the tens place $1$ moves straight down as there is no number to subtract from.
$\quad 15.8\\ - \, 3.5\\ \underline{--------}\\ \quad 12.3$
Step 3: Conclude with the final answer.
The result of $15.8 - 3.5$ is $12.3$ .

Therefore, the correct answer is: $12.3$ .