Jenny has been saving her babysitting money for a class field trip to Washington, D.C. She wants to save $\$200.00$ over three months. She saved $\$53.00$ the first month and $\$67.00$ the second month.

1. Estimate (without calculating) the amount that Jenny needs to earn during the third month to meet her goal.

   Hint (a):

   Rounding makes numbers easier to add.

2. Now show how Jenny could calculate the amount of money she needs to earn.

   Hint (b):

   How much money does Jenny already have?

   Step 1 (b):

   Add what Jenny has saved in her first and second months.
   $\$53.00+\$67.00=\$120.00$

   More Help (b):

   If she needs $\$200.00$ and has $\$120.00$, how much more money does Jenny need? Subtraction will help..