Estimate the sum or difference . Use the benchmarks of 0,1/2 and 1

23/40-9/30

4 answers

Simplify 9 / 30.

9 / 30 = 3 ∙ 3 / 3 ∙ 10 = 3 / 10

Multiply numerator and denominator by 4

3 / 10 = 4 ∙ 3 / 4 ∙ 10 = 12 / 40

23 / 40 - 9 / 30 = 23 / 40 - 12 / 40 = 11 / 40
Estimating:

1 / 4 ≤ 23 / 40 ≤ 3 / 4

Rund it to 1 / 2

1 /4 ≤ 9 / 30 ≤ 3 / 4

Round it to 1 / 2

Estimating:

1 / 2 - 1 / 2 = 0
Very helpful, tho try simplifying your answer so everyone can read it
Inferential statistics quick check