Question

Marrisa added 1.56 and 13.47. She got 29.07. What mistake could Marrisa have made?

a)She forgot to move the decimal point to the left after she added.
b)She lined up the front numbers instead of the decimal places.
c)She lined up the last numbers instead of the decimal places.
d)She didn’t carry correctly between place values.

Answer 1

The person above is right, the correct answer is b!

Answer 2

Marissa made of the mistake of computing 15.6 + 13.47 = 29.07

Instead she should have done 1.56 + 13.47 = 15.03 which is the proper answer

She lined up the digits incorrectly. The mistake she made was lining up the front numbers instead of the decimal points.

This is why the answer is choice B