"An intuitive sense of number begins at a very early age. ...Piaget called this ability to instantaneously recognize the number of objects in a small group 'subitising'. As mental powers develop, usually by about the age of four, groups of four can be recognized without counting." from https://nrich.maths.org/2477
Our main focus in Kindergarten math is developing number sense. We use Envisions, Math Investigations and Kathy Richardson’s ,Developing Number Concepts. Students learn to explain their thinking as they work through hands-on activities. Students develop strategies for accurately counting quantities to 10 and beyond. Students have repeated experiences joining (adding) two or more amounts, removing (subtracting) an amount from a whole, and decomposing a number into two or more parts (place value). Throughout the year we will discuss counting, decomposing numbers up to 10, measuring lengths, patterns, functions, geometry (2-D and 3-D shapes), addition and subtraction, as well as data analysis. Following the Common Core State Standards, we will explain our thinking verbally as well as in writing.