Question

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

Answer 1

She hadn't lined up the decimal points correctly.

Incorrect way:

13.47
1.56

Correct way:

13.47
1.56

Add them up to get the right answer.

13.47
1.56
+____
15.03

So, the answer is 15.03.

Answer 2

Marrisa didin't line up decimals correctly.

Explanation:

We have been given that Marrisa added 1.56 and 13.47. She got 29.07. We are asked to find Marrisa's mistake.

Marrisa made a mistake, while writing 1.56 and 13.47 as a addition problem, We didn't place decimal correctly. She would have placed her digit as show below:

13.47

+ 1.56

29.07

The correct answer would be:

13.47

+ 1.56

15.03

Therefore, Marrisa didin't line up decimals correctly.