Place Value & Base Ten Math Unit for Fourth Grade4.NBT.A.1 (understanding that the place to the left is worth 10 times the place to the right) Math lesson plans for teaching place value understanding:These place value lesson plans cover the following concepts: -finding patterns in the base ten place value system-understanding and explaining why each place value is 10 x the place to the right-writing x 10 place value equations using number names-writing x 10 place value equations using place