The four operations are addition, subtraction, multiplication, and division.

Representing and solving word problems involves choosing the correct operation(s).

Some word problems involve money.

To find the difference in the amounts, subtract $25.10 from $36.80.

Remember to line up the decimals.

Subtract the columns from right to left.

The difference in the amounts Ken spent on the two ties is $11.70.

Multiply the number of months by the monthly charge.

So, three months at the rock climbing gym is $99.