(179.3)/(61.5) *10 time both sides by 10 to get rid of the decimal
1793/615
615*2= 1230 615 goes two times into 1793 before exceeding
1793-1230=563 remainder which is less than 615 hence will give a decimal when divided by 615
563/615= 0.9
2+0.9 = 2.9 is the answer
for a longer decimal you can easily use a calculator