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No.
1 2/4 + 2 3/4 = ?
is the answer 4 1/2 hours
1 2/4 + 2 3/4 = ?
On Monday, Jen spent 1 1/2 hours working on the car.
On Tuesday, she spent 2 3/4 hours on the car.
To add these two amounts, let's first convert the mixed numbers to improper fractions.
1 1/2 = (2 * 1) + 1 = 3/2
2 3/4 = (4 * 2) + 3 = 11/4
Now we can add the two improper fractions:
3/2 + 11/4 = (3 * 4 + 11 * 2) / (2 * 4) = (12 + 22) / 8 = 34/8 = 4 1/4
So, the answer is actually 4 1/4 hours, not 4 1/2 hours.