Associative, Commutitive or Distributive
450x80
80x450
Commutative
a number sentence that contains an equal sign
equation
Associative
The base ten block consisting of one hundred 1-cm cubes
flat or base ten hundreds
(2x9)x3
2x(9x3)
Associative
a way of writing a number as the sum of the values of each digit
expanded notation
an answer close to, or approximating an exact answer
estimate
4(8x7)=(4x8)+(4x7)
Distributive
Sets with the same number of elements such as cars with 5 passengers each, rows with 6 chairs each
Equal Groups
a rectangular array with the same number of rows as columns. Picture an array of for the number 16 or 9 or 25
square array
a×(b+c)=(a×b)+(a×c)
Distributive
a set of objects arranged in equal rows and equal columns
array
a counting number that is divisible by 2
even number