Greeting Card Math
Christmas 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.
Find the volume of your Greeting Card Box.
Take measurements in centimeters.
V = l·w·h
Height
Length
Width
Finding Surface Area
Method 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 1
Find 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 2
Find the surface area of your box.
SA = 2(height)(length) + 2(height)(width) + 2(length)(width)
Height
Length
Width
The winner to the estimation
contest is the person who estimated
closest to the volume of their box.