Question

Lori solved this multiplication problem 29x31=699. The mistake Lori made when multiplying is that she didn’t:

A) Carry over the digit properly

B) Multiply the units place correctly

C) Account for the tens place

D) Use the correct multiplication method

Answer 1

Lori made an error by not properly accounting for the tens place in the multiplication problem 29x31, which resulted in the incorrect answer of 699 instead of the correct answer of 899.

Step-by-step explanation:

The multiplication problem in question contains an error. To identify Lori's mistake, let's look into the common multiplication errors and evaluate which one likely occurred. A correct multiplication of 29 by 31 should be performed as follows:

• Multiply the ones place of the second number by each digit of the first number and write the result.
• Then multiply the tens place of the second number by each digit of the first number, making sure to shift the result one place to the left.
• Add the results from steps one and two to get the final answer.

The correct multiplication would be:

29
x31
----
29 (1 x 29)
+870 (30 x 29, note the shift to the left for the tens place)
----
899

Since Lori got 699 instead of 899, it seems that she likely made an error by not accounting for the tens place properly when multiplying, which corresponds with option C from the provided choices.