Anna calculated the area of parallelogram with a base of 72

5

m and a height of 2 m. Her work is shown here.

A = One-half b h = one-half (7 and two-fifths) (2) = one-half (StartFraction 35 Over 5 EndFraction) (StartFraction 2 Over 1 EndFraction) = StartFraction 70 Over 10 EndFraction = 7 meters squared

What errors did the student make? Select all that apply.

She used the incorrect area formula.

She substitute the values for the base and height incorrectly.

She converted the mixed number to an improper fraction incorrectly.

She multiplied incorrectly.

She simplified the fraction StartFraction 70 Over 10 EndFraction incorrectly.

A and C

Step-by-step explanation:

i got it right on edge

- She converted the mixed number to an improper fraction incorrectly.

- She converted the mixed number to an improper fraction incorrectly.

Step-by-step explanation:

Area of a parallelogram = Base*height

Given Base = 7 2/5m

Height = 2m

Substituting this values in the formula:

Area of the parallelogram = 7 2/5 * 2

Converting the mixed fraction to improper fraction, we have:

Area = 37/5 * 2/1

On multiplying

Area = 74/5

Area = 14 4/5m²

Based on the calculation, the following are the errors made by the student

- She used the incorrect area formula. She used 1/2bh instead of bh

- She converted the mixed number to an improper fraction incorrectly.

The improper fraction 7 2/5 was wrongly converted. She converted it to 35/5 instead of 37/5.