Estimate whether the sum is reasonable or not for 1/5+5/8 is about 3/4.

Yes

Step-by-step explanation:

You can estimate 1/5 to 1/4 and 4/8 to 2/4 Therefore 1/4+2/4 is 3/4

- 8 14/27

Step-by-step explanation:

first you need to adjust the bases.

-4 1/6 * 2 2/9

the bases are not the same so you need to do a little more of adjustments:

first:

-4 1/6 = -4*6/6+1/6 = -24/6+1/6 = (-24+1)/6 = -23/6

then:

2 2/9 = 2*9/9+2/9 = 18/9 + 2/9 = (18+2)/9 = 20/9

now you can work it out:

-23/6 * 20/9

Factorize pairs

-23/3 * 10/9

multiply:

-230/27 = - 8 14/27