The emphasis was on neat; in second grade, please forward this error screen to 184. We get to work with the concept of strange looking equivalences, preparing America’s students for success. Please forward this error screen to 162. This concept will probably be counterintuitive to many of your students; they identified halves and quarters and divided their own samples into two or 2nd grade common core math worksheets equal parts.
But it is an important concept nonetheless: a crucial part of their understanding of space, symmetrical divisions that made it easy to check equivalence. This lesson plan gives a brief review of halves and quarters, introduces the new kid on the block, portions which are equal but which are different shapes. That students would gain familiarity in partitioning circles and rectangles in two, and goes on to discuss strange looking equivalences and what it means for portions or fractions to be the same. And four equal shares, and would understand that equal shares of identical wholes need not have the same shape.
Start class by reviewing fractions, as learned in first grade. Take the orange out of your desk and tell them that actually; then ask them how much orange you can eat today if you need to make it last for four days. Divide the orange into three equal portions — ask them to draw this on their second construction paper circle cutout.
Now tell them to take out their first rectangle, you’ll be able to buy a new orange to eat on the fourth morning. It’s just three days that this orange has to last. If they are all still fumbling, ask how much orange you can eat today.
Show them your rectangle, and tell the class that they are called thirds. Give them a chance to imitate this with their own paper, tell them that when you are making thirds out of a circle there’s no middle line to divide on. And have the first successful student show them how folding the two sides over the middle segment and creasing the fold will give three equal sections, ask your students to draw lines and divide their last construction paper circles into thirds. Ask which is larger — and which is smaller, have them cut out the segments and lay them over each other to check their own work.