In math we use the Harcourt Math Series. The concepts covered in first grade are: Numbers 0-20, Addition facts through 20, Subtraction facts through 20, Place Value, Time and Money, Measurement, Graphing, Fractions, Geometry, Fractions, and Measurement.
It is very important to practice your addition and subtraction facts as often as possible. These facts are not only necessary for first grade, but you will need to know them forever! :)
Below are some fun websites to pratice your math facts: