All this calendar month has a sec grade focus. Today's activity/lesson teaches CCSS.2.G.A.2 which reads...
Partition a rectangle into rows too columns of same-size squares too count to discovery the full position out of them.
Concepts: Area, shapes, measurement--Partitioning anything into squares is actually all nigh area.
Supplies: Easy--blank paper, ruler (recommend amongst cm measurement), pencil, too 2 colors (either 2 crayons or markers)
Time needed: xxx minutes for a class, but if doing at habitation it tin give notice last every bit lilliputian every bit 15.
Instructions:
- Have educatee manus describe a rectangle on their blank page. You may desire to remind the kids that rectangles corners are ninety grade angles (like an L shape), too thence when they describe their rectangle they create the best forthwith edges they can. (I used a pen, but students volition operate a pencil)
- Using a ruler commencement at 1 of the corners too brand a grade at each centimeter. On each of the parallel sides (BTW y'all should operate these price amongst the kids--it's of import to learn math vocabulary early on) brand certain to commencement measuring at the same place. For example, on the vertical lines I started measuring at the transcend too on the horizontal lines I started measuring on the left. (You could create this whole do amongst graph newspaper but your students wouldn't get got the challenge of making a grid inward their free-hand rectangle).
- You volition in all likelihood discovery that non all the corners are just L shaped (90 grade angles) too thence y'all volition take away to redraw closed to of the sides to brand them straight. Use the ruler to describe a business betwixt the ii measured points.
- Explain that the columns become upward too downward (vertical) too rows become across, side to side (horizontal). Most probable the rectangle volition non last an an exact cm mark--just operate the closest cm grade to a consummate cm)
- Count the position out of squares downward each column too position out them (that is how many rows at that spot are). In this instance at that spot are half dozen squares for each column. Kids powerfulness non last able to count yesteryear 6s (or yet many rows they get got amongst their rectangles), too thence nosotros count the columns yesteryear 2s (you tin give notice count yesteryear 1s but it simply takes longer too y'all could create 3s too). Each fourth dimension y'all brand a slash through the blocks y'all write the position out y'all are counting upward to (I drew a business nether each grouping of 3 numbers since that is 1 whole column).
Keep going until y'all fill upward inward the whole thing--finding the expanse within the rectangle. - Now, to double banking concern tally that nosotros did the expanse correctly nosotros volition also count the squares inward the rows. Label that--those are the position out of columns. Mine were slowly to count since at that spot were 10 squares inward each row. Then I simply skip counted 10 every bit I marked the counting.
- You powerfulness desire to inquire the kids which agency was easier for their rectangle--Counting yesteryear columns or counting yesteryear rows? Explain to the students that they simply constitute the expanse of a rectangle. It powerfulness get got been difficult to create it this way, but every bit they progress through math their volition last shortcuts to discovery the area. Once they know multiplication it is simply the summit (vertical measurement) times the width (horizontal measurement). In this instance nosotros had half dozen rows of 10 (6 x 10) or 10 columns of half dozen (10 x 6), but equal the same lx squares.
I promise y'all enjoyed Squarin' Up Rectangles!
Now it is your plough to portion a math activeness if y'all want. Here is the template too y'all tin give notice link upward your sec grade activeness whatever fourth dimension this month. In other months nosotros volition get got other grades too.
I can't expect to consider what kinds of activities y'all have!
