Post on 23-Dec-2015
Greeting Card MathChristmas Card Box
Look at your teacher’s box and estimate the
number of M&M’s in the box.
Find the area and perimeter of your card when it is
closed.
Find the area and perimeter of your card when it is open.
Cut the greeting card in half along the crease to create two congruent rectangles.
Make a shutter-fold
Make a shutter fold by folding outer edges to the center.
Repeat in the other direction.
Flatten all creases
Use scissors and cut on the vertical line up to the horizontal line, on the bottom
right fold. STOP AT THE HORIZONTAL LINE!!!
Repeat in all 4 corners as shown above.
Turn your card so that you can see the message.
Fold the left and right rectangles up at the
creases and then the top and bottom rectangles to form a rectangular box.
To secure the box together, fold the overlap of the larger end rectangles over the slender
sides and crease.
Length
Height
Width
Find the volume of your Greeting Card Box.
Take measurements in centimeters.V = l·w·h
Finding Surface AreaMethod 1
The surface area is the area of the outside of your box.
Find the area of each rectangle on the outside of your box.
How many rectangles (faces) are on your box?
6
Method 1Find the surface area of your
box.Find the area of each
rectangle.Front rectangle: length = _______ x width = ________ Area = _______
Back rectangle: length = _______ x width = ________ Area = _______
Side rectangle: length = _______ x width = ________ Area = _______
Side rectangle: length = _______ x width = ________ Area = _______
Top rectangle: length = _______ x width = ________ Area = _______
Bottom rectangle: length = _______ x width = ________ Area = _______
Add the areas of each rectangle together to get the surface area of the box.
Method 2Find the surface area of your
box.
SA = 2(height)(length) + 2(height)(width) + 2(length)(width)
Length
Height
Width
The winner to the estimation contest is the person who
estimated closest to the volume of their box.