How many problems did they solve in November?

Question

The math club solved 728 problems in October.
They solved 115 more problems than that in November.
How many problems did they solve in November?

Answer 1

Let me set this up for you:

  728

+115

--------

  ???

We start in the ones column and move to the left:

8 + 5 = 13

 

  7¹28
+1 15
--------

    ??3

 

2 + 1 + 1 = 4

  7¹28
+1 15
--------

    ?43

 

7 + 1 = 8

  7¹28
+1 15
--------

   843

 

So they solved 843 problems in November.

Answer 2

Hi Young, this is an addition problem.  728 problems +115 more problems=843 problems for November.