Money
Free Math Games & Activities for Kids
Money is usually taught in 2nd Grade in the US. The Common Core Standards are a little tricky for the subject and the learning abilities for this age group so many schools opt to bring it in during the end of 2nd or even the third grade.
Below are great Classroom activities and Games all about Money:
Here is a great teaching guide by a teacher: Teaching the concept of Money
Grade 2 Common Core Math Measurement Data Work with Time and Money