Transcript What comes in an array?

Factors, Multiples and
Arrays
By Reagan and Cooper Harris
(when they are 4th graders)
What on earth is an
array?
Array
Rectangular shape,
or even a square!
Rows and columns
A way to multiply…
or divide,
Oops we’re not there
Yet!
What comes in an array?
• Eggs
• Diet Dr. Pepper
• stamps
Let’s explain those
arrays!
Which Array? How Many?
(Product)
Egg carton
12
Mrs. Harris’s
Favorite
Drink
Stamps
6
6
Dimensions
(factors)
2 rows of 6
2x6
3 rows of 2
3x2
2 rows of 3
2x3
Let’s make arrays for 16:
This is one row of 16: 1 x 16
This is 2 rows of 8: 2 x 8
This is 4 rows of 4: 4 x 4
Check it out…this proves 16 is a square number!
So what are the factors
of 16?
1
2
4
8
16
Remember 4 x 4 is 16, so it doesn’t
have a “factor partner.”
What do we need to
know?
• An array is a rectangular/square
arrangement of objects to prove
multiplication.
• A factor is a number you multiply with
another number to make a product.
• A product is created by a factor pair. It
is the answer to a multiplication problem.
What we found out that
was cool!
• A square number is a product made
by using a factor multiplied by itself.
– Example: 9 is square because 3 x 3 =9
– 16 is square because we showed 4 rows
of 4 is 16.
– How about finding your own square
numbers?
We wonder…..
Who can explain prime numbers?
Resources
• Our awesome lessons from:
Factors, Multiples and Arrays
• http://www.teachers.ash.org.au/je
ather/maths/dictionary.html
• http://www.freedigitalphotos.net
– Stamp photo