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
Estimate the sum or difference . Use the benchmarks of 0,1/2 and 1
23/40-9/30
4 answers
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
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