## Thursday, November 28, 2013

### Happy Thanksgiving! & MaTh activity Thursday: 4.MD.A.3

I hope everyone is having a wonderful Thanksgiving!  I have so many things I am grateful for--family, friends, a home, food, and many more blessings.  I hope we can all take a minute or two and think about all we have to be grateful for.

Now time for MaTh activity Thursday with CCSS 4.MD.A.3: Apply the area and perimeter formulas for rectangles in real world and mathematical problems. For example, find the width of a rectangular room given the area of the flooring and the length, by viewing the area formula as a multiplication equation with an unknown factor.

I great book for this is Spaghetti for All by Marilyn Burns.  It covers perimeter (setting up chairs) with the same amount of area (tables).  It's a clever book.

I do have an activity for today.  I love doing more open ended activities than worksheets (as you might have gathered if you read my blog very often).  So here it goes.

What's the missing value?
Supplies: 2 groups of 3x5 cards (one group has the numbers 2-10 and the other group has 12-25), grid paper for the children to work with and draw out the answers.
Lesson: Discuss the two formulas of area and perimeter and do a few samples together.  Area= length x width, Perimeter= (length x 2) + (width x 2)
Instructions: For this activity you will be picking one card from each of the two piles.  The card from the 2-10 pile will be the length and the card from the 12-25 card will be the area or perimeter (depending on which one you are working on).

You can get the area freebie here.

and the length activity here.

and if you need grid paper to work with you can print this

Sometimes the numbers you pick might challenge the students because they will have to use a fraction, but I know they can figure it out.  You can always pick a different card if you know the children need it to be simpler.

If are doing area and you pick 3 x ? = 22 they should draw out that length and then figure that they know 3x7 is 21 so they need to split one more block three ways ?= 7 1/3.

And if they are doing Perimeter and They get an odd number they are going to need to have one distance be something and a half.

Let me know how it goes...  You can link up any math post you have with Math activity Thursday until next Wednesday.