In this 3.MD.8 Third Grade Common Core Lesson, studentsfind the perimeter of polygons using knowledge of shapes to solve for missing lengths.

Using this Common Core Standards Lesson Plan Template, teachers will be able to keep track of your lesson plans and the state standards that you are using.

This plotting measurements activity has 3rd to 5th Grade students measure garden objects to the quarter inch and build a line plot, with practice and an answer key included.

This measure it comparing lengths activity has 2nd and 3rd Grade students measure true-size objects in inches and find how much longer one is. Answer key included for easy checking.

This blast off with numbers base ten words expanded form activity has 2nd and 3rd grade students match planet and rocket cards that show one number three ways. Answer key included.

This why does it work addition subtraction strategies activity has 2nd-3rd grade students match worked problems to the reasons that explain them. Answer key included for fast checking.

This let's get graphing activity helps 2nd and 3rd grade students match graph words to their meanings, label a bar graph and solve graph problems. Answer key included.

This I Have Who Has multiply divide within 100 activity is a whole-class 3rd-4th grade fact game with 24 linked star cards and a practice page. Answer key included.

The On the Water Way with Arrays Activity has 2nd and 3rd grade students match sailboat arrays to multiplication facts and write turnaround facts. Answer key included for easy checking.

This measure it measurement tools activity has 2nd-3rd grade students sort picture cards onto ruler, yardstick and measuring tape mats, with a practice page and answer key included for confident measuring.

This popcorn mental math activity lets 2nd and 3rd grade students add and subtract 10 and 100 in their heads with a fun partner card game, recording sheet, and practice page. Answer key included.

This 3.NBT.1 Common Core Activity lets 3rd Grade students round numbers to the nearest 10 or 100 by sorting 24 cards into Round Up and Round Down, with an answer key included.

This Quotient Quickies Division activity has 3rd-4th grade students match wave division cards to whale quotient cards and write the related times fact, with a practice page and answer key included.

This who can divide word problems activity for 3rd and 4th Grade has kids match one- and two-step division problems to equations and solve. Answer key included.

This road race multiplication division activity is a board game for 3rd and 4th grade with 20 self-checking cards for finding the missing number. A practice page and answer key are included.

Children sort shape picture cards under one half, one third, one fourth, one sixth, one eighth or not equal in this 1st to 3rd grade fraction game. Recording sheet, practice page and answer key included.

This skip counting 3s carousel worksheet has 3rd graders count up and back by threes around a carousel and in two story problems. An answer key is included for quick, easy checking.

This organizing measurements worksheet has 3rd graders plot crayon lengths in halves and quarters of an inch on a line plot, then answer data questions. An answer key is included for easy checking.

The Jelly Bean Data Worksheet has 3rd grade students read a bar graph where each square is four jelly beans, then compare, add and solve two-step problems. An answer key makes checking quick.

This what is the area inside worksheet lets 3rd grade students split grid shapes into two rectangles, add the parts, and find the total area. An answer key is included for quick checking.