Deepening our sense of numbers, first graders are learning about the relationship between numbers and place value.  Place value is the value of a digit depending on its position in the number, such as ones, tens, hundreds, and thousands places.   We are learning that our system of number writing is called a base-ten system as it is based on groupings of ten.  Using manipulatives such as base-ten blocks, unifix cubes, place value mats, and hundreds charts, we are building and breaking down numbers.  Students will be reading, writing, and comparing numerals into the thousands place through the use of worksheets and games.