Solve the Subtraction Equation: 7800 minus 690

To solve the problem $7800 - 690$, we will follow these steps:

• Identify the numbers: The minuend is 7800, and the subtrahend is 690.
• Perform the subtraction: We will subtract 690 from 7800.
• Calculate step-by-step:

Let's perform the subtraction $7800 - 690$:

Arrange the numbers so that they align by place value:

$\begin{array}{c} 7800 \\ -\ 690 \\ ------ \end{array}$

Subtract each column starting from the rightmost digit (units place):

• The units place: $0 - 0 = 0$.
• The tens place: Since $8 - 9$ would require borrowing, borrow 1 (100) from 700, making it 7 becomes 6 (600, or 60 in the borrowed context) and 10 becomes 18 in the tens column. Now $18 - 9 = 9$.
• The hundreds place: After borrowing, $6 - 6 = 0$.
• The thousands place: $7 - 0 = 7$.

Writing down the results of each place value, we find that:

$\begin{array}{c} 7800 \\ -\ 690 \\ ------ \\ 7110 \end{array}$

Thus, the solution to $7800 - 690$ is $7110$.

The correct answer, according to the multiple-choice options provided, is choice 2: $\mathbf{7110}$.