numbers or letters and common operation sign.
See if each side of the equation
has the same numbers and operation signs.
Write the statements so that
the first one is on the left side of the equal sign and the second
one is on the right side. Use a highlighter or colored pencil to look
at each side and decide if there are the same numbers and operation
"All the numbers and signs in
both equations have check marks, that means that each equation has the
same numbers and operation signs."
"Now I need to look at the both
sides and see if the numbers on the right side of the equation are in
opposite positions from the left side of the equation."
"When I look at the two equations,
the "2a" is the first number on left side but is the second number
on the right side. The 4 is the second number on left side but is
the first number on the right side."
" When I compare 2a + 4 and 4
+ 2a, they are mirror images."
A ddition or multiplication?
"There is an addition sign on the left side
and an addition sign on the right side."
- The total of each side is equal.
Solve each equation and see
if you get the same answer
" If a is 2, then when I solve 2a + 4, I get
the answer 8; and when I solve 4 + 2a, I get the answer 8. The total
of each side is equal. This statement represents the Commutative Property."