### Home > CC1MN > Chapter 2 Unit 2 > Lesson CC1: 2.3.2 > Problem 2-67

2-67.

Jenny has been saving her babysitting money for a class field trip to Washington, D.C. She wants to save

*Estimate*(without calculating) the amount that Jenny needs to earn during the third month to meet her goal.Rounding makes numbers easier to add.

Now show how Jenny could

*calculate*the amount of money she needs to earn.How much money does Jenny already have?

Add what Jenny has saved in her first and second months.

If she needs

and has , how much more money does Jenny need? Subtraction will help..