We cover many math skills in kindergarten:

Counting to 100 by 1s and 10s

Counting on from a number other than 1

Writing numbers 0-20

Representing numbers with groups of objects

Greater than, less than and equal to

Adding and subtracting

Word problems

Tens and ones

Measurement - length and weight

Classification and sorting

Shapes - 2-dimensional (flat) and 3-dimensional (solid)