4 years & up. Teach your children how to count money with these Mixed Fake Dollar Bills for Math Practice or Dramatic Play. This set of fake dollar bills promotes early math skills, critical thinking, and collaborative. These bills are great to add to pretend lemonade stands or for practicing addition and subtraction. This mixed bills money set contains 25 x $1.00, 20 x $5.00, 20 x $10.00, 20 x $20.00, 5 x $50.00, and 10 x $100.00 US bills. Total of 100 pieces.