Calculate the Difference: Solving 30.4 - 12.6 Step by Step

Video Solution

Solution Steps

00:00 Solve

00:03 We'll use long subtraction for calculation

00:08 We'll place the decimal point in the appropriate position

00:12 The digit is smaller than the digit we need to subtract from

00:17 So we'll borrow from the next possible digit

00:20 The larger digit will decrease by 1, and our digit will increase by 10

00:24 Again we'll use the same method and borrow from this digit

00:38 Now we'll subtract from the larger number and place

00:50 We'll continue to subtract and place accordingly

01:10 And this is the solution to the question

Step-by-Step Solution

To solve the subtraction problem $30.4 - 12.6$ , follow these steps:

Step 1: Write the numbers vertically, ensuring that the decimal points are aligned:

$\begin{array}{c} 30.4 \\ - 12.6 \\ \hline \end{array}$

Step 2: Begin subtracting from the rightmost column, which is the tenths place in this case:

The tenths column: $4 - 6$ . Since 4 is less than 6, we need to borrow from the whole numbers to the left. The 0 in the units column of 30 becomes 10 (because we borrow 1, which makes it 10 in decimal terms), and the 3 becomes 2.
Now, 14 - 6 = 8. Write 8 in the tenths place. The result so far is 0.8.

Step 3: Move to the units place (whole numbers column):

Step 4: Move to the tens place:

Subtract $3 - 1 = 1$ (remember we borrowed 1 earlier, hence it is now 2 in place of originally 3, subtracting 1 gives 1).
Write 1 in the tens place. The final result is $17.8$ .

Therefore, the solution to the problem $30.4 - 12.6$ is $17.8$ .