This is a complete 13 day math unit to teach Third Grade Common Core Math Standards 3.OA.9 and 3.NBT.3- Addition and Multiplication Patterns and finding the product of a whole number and a multiple of 10. In this unit, students will learn to complete one and two step patterns in addition and one step patterns in multiplication. Students will also learn to complete missing numbers in an input/output box. Finally, students will learn to use base 10 blocks and number lines to find the product o