All Operations in Decimal Fractions: Basic subtraction

To solve the subtraction problem $0.25 - 0.1$, follow these steps:

• Step 1: Align the numbers vertically, ensuring that the decimal points line up:

   0.25
-  0.10
-------

• Step 2: Start subtracting from the rightmost column. The tenths position involves subtracting $5$ from $0$, resulting in $5$.
• Step 3: Move to the next column to the left. Subtract $0.1$ from $0.2$, which gives $0.15$.
• Step 4: The integer part of both numbers is zero, there is nothing to subtract here.

The result of the subtraction is $0.15$.

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: $12.3$.

Let's solve the problem step by step:

• Step 1: Align the numbers by their decimal points:
  $\begin{array}{c} 5.7 \\ - 2.3 \\ \hline \end{array}$
• Step 2: Subtract the digits in the tenths place $7 - 3 = 4$.
• Step 3: Subtract the digits in the units place $5 - 2 = 3$.
• Step 4: Write down the result by combining both differences, making sure to keep the decimal point aligned: $3.4$.

Therefore, the solution to the problem is $3.4$.

To solve this problem, we'll follow these steps:

• Step 1: Align the numbers by their decimal points.
• Step 2: Subtract the subtrahend from the minuend.
• Step 3: Place the decimal point in the answer, directly aligned with the decimal points of the numbers.

Now, let's work through each step:
Step 1: Align the numbers, $6.8$ and $4.2$, by their decimal points:

$6.8$
$-4.2$
$\underline{\phantom{9.9}}$

Step 2: Subtract each digit starting from the rightmost end (tenths place). Subtract $2$ from $8$ to get $6$.
Then subtract $4$ from $6$ to get $2$.

$6.8$
$-4.2$
$\underline{2.6}$

Step 3: Make sure to align the decimal point in the answer with the other decimal points. The result is $2.6$.

Therefore, the solution to the problem is $2.6$.

To solve the subtraction problem $7.9 - 5.3$, we will follow a simple step-by-step process:

• Step 1: Align the decimal points of both numbers. Write $7.9$ directly above $5.3$ such that the decimal points are lined up vertically.

• Step 2: Perform the subtraction from right to left. Start with the tenths place:
  Subtract $3$ (from 5.3) from $9$ (from 7.9) in the tenths place, resulting in $6$.

• Step 3: Move to the units place:
  Subtract $5$ (from 5.3) from $7$ (from 7.9) in the units place, resulting in $2$.

After subtracting, we find the result of the operation $7.9 - 5.3$ is $2.6$.

Therefore, the solution to the problem is$2.6$.