Parents in first or second grade kids will have to learn how to count money and figure out change which will last throughout all of their lives in story problems. An easy way to make this work is to play store.
1. Take old objects (and new if you choose) and add a price tag to each, depending on what you think they would actually cost.
2. Think through the prices depending on the child's skill level. For a first grader try using only values that use quarters, 25 cents 50 cents 75 cents one dollar and so on. For a third grader or older start using less normal numbers. Ending in any number instead of only 5's and 0's.
3. Have your child pick out a set number of items and have them total their purchase.
4. Have them give either exact amount of money or make them use dollar bills only to pay.
5. If they used dollar bills have them tell you how much change they should get.
This is a very fun and easy way to learn cash math for kids.