Question

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one of the digits in your answer is wrong. check your work carefully.
kala cut away 4.78 meters of rope. before that, she had 8 meters of rope. how much rope does kala have left?

Explanation:

Step1: Identify the operation

We need to find the remaining rope length, so we subtract the length cut away from the original length. The formula is $Remaining = Original - Cut\ away$.

Step2: Substitute the values

Original length is 8 meters, cut away is 4.78 meters. So we calculate $8 - 4.78$.
To subtract, we can write 8 as 8.00 (to have the same decimal places). Then subtract:

$$\begin{align*} 8.00 - 4.78&=(7 + 1.00) - 4.78\\ &=7 + (1.00 - 4.78)\\ &=7 - 3.78 + 1\\ &=3.22 + 1\\ &= 3.22 \end{align*}$$

Wait, no, correct subtraction:

$$\begin{align*} 8.00\\ -4.78\\ \hline 3.22 \end{align*}$$

Wait, 8.00 - 4.78: 0 - 8 can't be done, so we borrow from the tenths place, but tenths place is 0, so we borrow from the ones place. 8 becomes 7, tenths place becomes 10, then borrow from tenths place to hundredths place: tenths place becomes 9, hundredths place becomes 10. Then 10 - 8 = 2 (hundredths), 9 - 7 = 2 (tenths), 7 - 4 = 3 (ones). So 3.22. Wait, but let's check again. 4.78 + 3.22 = 8.00. Yes, that's correct.

Answer:

3.22 meters