In 2011, the number of students who signed up for a computer course
was 445. In 2013, the number had increased to 900. How many more
students signed up in 2013 than in 2011?
A) 455 (Correct Answer)
B) 555
C) 545
D) 445
Explanation:
This exercise requires subtraction with regrouping. The problem would probably be easier to solve
if written vertically. Regrouping is required in the ones and tens digits. The difference is calculated
to be 455.
Related Common Core State Standard: 4.NBT.4
