Regular is 2 and 5/40
Simplified is 2 and 1/8
A). The second one and the fourth one combined make the object ( a )
B). First one and the last one combined make the object ( b )
C). First one and the third one combined make the object ( c )
<u>Answer:</u>
B. He multiplied the dividend by 100 instead of 10.
<u>Step-by-step explanation:</u>
Chen had to divide
by
. To make it easier to divide, he thought of multiplying both the dividend and the divisor by 10.
Chen multiplied the divisor by 10 but mistakenly multiplied the dividend by 100 instead of 10.
So his whole division problem was changed.
Therefore, the correct answer option is B. He multiplied the dividend by 100 instead of 10.