Estimating 5 and 9/10ths times 2 and 2/3rds might be done by considering that 5 and 9/10ths is about 6, and 2 and 2/3rds is somewhat less than three. Six times three is eighteen, but it's less than that by a couple or three, so the answer is about fifteen or sixteen.
.264
15
negative fourth fifths is less than negative one-third
15
1.5
The answer is seven fifteenths.Hope it helped!
4/5
21/40
3/40
Hint: four-fifths of "seven" is "even". Now how is one-third of one-half "el"?
One third of three fifths is one fifth.
1/3 X 24/5= 8/5