Question

1. subtract 9.12 from 23.08.

13.96
13.94
14.04
32.2

Explanation:

Step1: Set up the subtraction

We need to calculate \( 23.08 - 9.12 \).

Step2: Perform the subtraction

Align the decimal points:
\[

$$\begin{align*} 23.08\\ - \ \ 9.12\\ \hline \end{align*}$$

\]
Subtract the hundredths place: \( 8 - 2 = 6 \).
Subtract the tenths place: \( 0 - 1 \), we need to borrow from the ones place. So the 3 in the ones place becomes 2, and the 0 in the tenths place becomes 10. Then \( 10 - 1 = 9 \).
Subtract the ones place: \( 2 - 9 \), we need to borrow from the tens place. The 2 in the tens place becomes 1, and the 2 in the ones place becomes 12. Then \( 12 - 9 = 3 \).
Subtract the tens place: \( 1 - 0 = 1 \). Wait, no, actually, let's do it properly:
\[
23.08 - 9.12 = 13.96
\]
Wait, no, wait:
Wait, 23.08 - 9.12:
23.08
-9.12
= (23 - 9) + (0.08 - 0.12)
= 14 + (-0.04)
Wait, no, that's wrong. Wait, 23.08 - 9.12:
Let's do decimal subtraction:
23.08

• 9.12

= 13.96? Wait, no, 23.08 - 9.12:
23.08 - 9 = 14.08; 14.08 - 0.12 = 13.96. Yes, that's correct.

Wait, but let's check again:
23.08

• 9.12

= 13.96.

Wait, but the options have 13.96 as the first option. Wait, but when I did the borrowing earlier, I made a mistake. Let's do it digit by digit:

23.08

• 9.12

= (22 + 1.08) - (9 + 0.12)

= (22 - 9) + (1.08 - 0.12)

= 13 + 0.96

= 13.96.

Yes, that's correct.

Answer:

13.96 (the first option, A. 13.96 if we consider the options as A. 13.96, B. 13.94, C. 14.04, D. 32.2)