Question

1. subtract 25.87 from 49.22.

23.35
24.65
24.35
23.65

Explanation:

Step1: Set up the subtraction

We need to calculate \( 49.22 - 25.87 \).

Step2: Perform the subtraction

Subtract the two numbers:
\[

$$\begin{align*} 49.22 - 25.87&=(49 + 0.22)-(25 + 0.87)\\ &=(49 - 25)+(0.22 - 0.87)\\ &=24+(0.22 - 0.87) \end{align*}$$

\]
Since \( 0.22-0.87 \) is negative, we borrow 1 from the 24 (making it 23) and add 1 to the 0.22 to make it 1.22:
\[

$$\begin{align*} 23+(1.22 - 0.87)&=23 + 0.35\\ &=23.35 \end{align*}$$

\]
Wait, that's incorrect. Wait, let's do decimal subtraction properly:

\[

$$\begin{array}{r@{}l@{}l} & 49.22 \\ - & 25.87 \\ \cline{1-2} & 23.35 \\ \end{array}$$

\]
Wait, no, wait: 49.22 - 25.87. Let's do digit by digit:

• Hundredths place: 2 - 7. Can't do, borrow from tenths. Tenths place: 2 becomes 1, hundredths becomes 12. 12 -7 =5.
• Tenths place: 1 (after borrowing) -8. Can't do, borrow from ones. Ones place: 9 becomes 8, tenths becomes 11. 11 -8 =3.
• Ones place: 8 -5 =3.
• Tens place: 4 -2 =2.

Wait, so 49.22 -25.87 =23.35? Wait, no, wait 49.22 -25.87:

49.22 -25.87:

49.22
-25.87
--------
23.35

Yes, that's correct. Wait, but let's check again: 25.87 +23.35 =49.22. 25.87 +23 =48.87, +0.35=49.22. Yes. So the result is 23.35.

Answer:

A. 23.35