how to round and estimate with decimals

Question

i dont understand what they mean to round and estimate the decimals like 0.88 divided by 8.27

Answer 1

round is kleer, estimut iz NE-1's ges

round(123.4567)=123...kauz 4<5

round1(123.4567)=123.5,    kauz next digit=5

round2(123.4567)=123.46

round3(123.4567)=123.457

Answer 2

655 + 546