Question

Zinc roofing weighs 1.6 pounds per square foot. Jose wants to order 357.85 square feet of roofing. Before ordering, he calculates how much weight that will put on his roof. His calculation is shown below.

357.85 times 1.6 = 214710. 214710 + 35785 = 178.925

Why is his answer incorrect?
He did not line up the decimal points in the factors.
He put the decimal point in the answer in the wrong place.
He did not use a placeholder when multiplying by one.
He did not multiply 6 by 357.85 correctly.

Answer 1

he didnt use a place holder when multiplying one

Explanation:

Answer 2

Answer:He is wrong because did not multiply 1.6 by 357.85 correctly.

Explanation:

The weight per square foot of zinc roofing is 1.6 pounds. Jose wants to order 357.85 square feet of roofing. The total weight of 357.85 square feet of roofing would be

1.6 × 357.85 = 572.56 pounds

His calculation was

357.85 times 1.6 = 214710. 214710 + 35785 = 178.925

He is wrong because did not multiply 1.6 by 357.85 correctly.