A complete 5 day math unit including: • Full lesson plans (including centers) • 20 pages of Printable teaching resources • Mental Math Exercise These second grade math lesson plans cover common core state standards: 2. NBT.2, & 2.NBT.8. They teach students to count by 10's and 100's forwards and backwards; identify 10 more, 100 more, 10 less, and 100 less; use place value and skip counting to solve addition and subtraction using mental math, it also includes mental math daily exercises to build students brain in number sense.