Question

this sum how can I do​

Answer 1

First write all numbers in one line like this

0.7

0.77

0.07

0.078

Then add zeros in the free space like this

0.700

0.770

0.070

0.078

Then compare and find the answer=

First - 0.070

Second - 0.078

Third - 0.700

Fourth - 0.770

Answer 2

Is descending order it is opposite