Brenna is buying 4.25 feet of ribbon for $1.95 a foot. She determines the product of the two numbers to determine the actual cost of the length of ribbon. Which expression will result in the best estimate for Brenna to use to check her multiplication?

Question

4 times 1
4 times 2
5 times 1
5 times 2

Answer 1

To estimate the cost of the ribbon Brenna is buying, we can round the numbers involved:

• The length of ribbon is 4.25 feet, which we can round to 4 feet or 5 feet for estimation purposes.
• The cost per foot is $1.95, which we can round to $2 for estimation.

Now let's check the provided expressions:

1. \(4 \times 1\) = 4
2. \(4 \times 2\) = 8
3. \(5 \times 1\) = 5
4. \(5 \times 2\) = 10

Using both rounded figures, if we estimate the cost using \(5 \times 2\) (which corresponds to rounding both 4.25 to 5 and 1.95 to 2), we get:

\[ 5 \times 2 = 10 \]

This is the best estimate for Brenna to check her multiplication. Therefore, the correct expression is:

5 times 2.