Fundamentals of math

Question

A parent died and left an estate to four children. One inherited 1/5 of the​ estate, the second inherited 1/2, and the third inherited 1/10. How much did the fourth​ inherit?

Answer 1

1 - (1/5 + 1/2 + 1/10) = 1 - (2+5+1)/10 = 1-8/10= 5/5-4/5 = 1/5

or work the problem with decimals

1/5 = .2

1/2 =.5

1/10=.1

.2+.5+.1 = .8

1-.8 = 0.2 = 1/5