Question

without finding the exact answer select which of the following numbers is the best estimate of each sum or difference and justify your choices: - 2/3, 0, 2/3
1/9 + 2/5 - 1/3 - 3/4

Answer 1

1/9 + 2/5 - 1/3 - 3/4
= (-1/3 + 1/9) + (-3/4 + 2/5) (both terms are negative)
= -2/9 + (-1/3) approx.
= -2/3 approx.

Answer 2

Thanks so much I understand now