2. Commutative Property of
Addition
- change the order of addends without changing the
sum
Example:
3+5=8 and 5+3=8
So, 3+5=5+3
9+6=15 and 6+9=15
So,
9+6=6+9
3. Associative Property of
Addition
- When finding the sum of three or more addends, add
two numbers at a time. Use parenthesis to group the
numbers that you will add first
- changing the grouping of addends does not change
the sum
Example:
(2+3)+5=? or 2+(3+5)=?
5+5=10
2+8=10
(7+8)+9=? or 7+(8+9)=?
15+8=24 7+17=24
4. Identity Property of Addition
- When zero is added to a number, the sum is
that number.
Example:
0+5=5
20+0=2
0
0+100=100
50+0=50
