Question

Use benchmarks to estimate each sum or difference.
17/18 - 3/7

A. about 1/4
B. about 1/2
C. about 0
D. about 1
i don't get it no matter how hard i try.

Answer 1

\[\frac ab\pm\frac cd=\frac{ad\pm bc}{bd}\]

Answer 2

About 1

Answer 3

@RebelChi, you're off. ;P

Answer 4

@across i have no idea how to do this

Answer 5

Okay lol my teacher answered this one for me

Answer 6

@meilendurcer, the numbers \(17\) and \(18\) are close to each other (their difference is \(1\)), because of this, the ratio \(17/18\) is about \(1\). Moreover, the number \(7\) is over twice as large as the number \(3\). Because of this, the ratio \(3/7\) is a little less than half. If you subtract one-half from one, what do you get?

Answer 7

1/4?

Answer 8

If I have a pineapple and I chew half of it off, how much will I have left?

Answer 9

1/2

Answer 10

There you go.

Answer 11

thank you