Practicing concepts at home is very important. Here are some great concepts to practice:
Add and subtract within 20.
Work with money by identifying and counting coins.
Make up simple addition or subtraction math stories for your child to solve. For example, "Sam had 3 cookies and his mom gave him 2 more. How many does he have now?" Adjust the numbers to your child's needs.
Practice identifying numbers.
Count to 120 starting with any number.
Practice telling time in hours and half-hours using analog and digital clocks.
(Based on the Common Core Standards)
Some family games that use math skills:
Dice, cards, and board games can help your child learn addition combinations.
Dominoes help students practice recognizing groups of dots as numbers (subitizing).
The card game “War” helps kids recognize which number is greater and which is less.
Yahtzee
Mancala
Uno helps with number identification
Any game that includes counting board steps, such as Candy Land.
(Many of these suggestions came from: http://www.dreambox.com/parent-tips-first-grade.)