Calculate 505 - 20.3: Decimal Subtraction in Vertical Format

Video Solution

Solution Steps

00:04 Let's solve this math problem together.

00:07 Place a zero in the missing spots, so we can line up the decimal points.

00:12 We'll subtract starting from the right side and move left.

00:16 If a digit is too small to subtract, borrow from the next one.

00:21 Remember, decrease the next digit by one, and add ten to the current digit.

00:26 Now, subtract using the larger numbers.

00:31 Do the math and place each number where it belongs.

00:35 Keep subtracting, calculating, and placing numbers correctly.

00:42 If another digit is too small, just borrow again.

00:46 We use the exact same method each time.

01:00 Calculate and place each number carefully.

01:08 Continue subtracting, calculating, and placing your results.

01:15 And that's how you find the solution to this problem!

Step-by-Step Solution

To solve this problem, we'll perform the subtraction $505 - 20.3$ step by step:

Step 1: Align the numbers
Write $505.0$ with a zero added in the tenths place for alignment:
$\begin{array}{c} 505.0 \\ - 20.3 \\ \hline \end{array}$
Step 2: Perform the subtraction
Start from the rightmost digit:
- Tenths column: $0 - 3$ cannot be done directly, so we borrow 1 from the units column, making it $10 - 3 = 7$ .
- Units column: Now $5 - 2 = 3$ , after borrowing $1$ .
- Tens column: $10 - 2 = 8$ because we've borrowed 1 earlier adding to the initial 0, leaving the column value as 4 from the hundreds place.
- Hundreds column: $4 - 0 = 4$ , after handling the earlier borrow.

After calculating, the result of $505 - 20.3$ is therefore:

$484.7$

Thus, the solution to the problem is $484.7$ .