Addition - combining of two groups into one group
Addends -the numbers that are added
Sum - the answer to an addition problem
Number sentence - a complete sentence that uses numbers and symbols instead of words
4 addend
+3 addend
7 sum
Commutative property of addition - When we add 2 numbers together, either may be first.
4+3=7 or 3+4=7
Identity property of addition - When we add zero to a number, the number is not changed.
4+0=4
Number lines
Line segment - a part of a line between 2 points - starts and stops
Line - continues in opposite directions without end
Positive numbers- Numbers greater than zero
Negative numbers- Numbers less than zero
6, 4, 2, 0, -2, -4, -6, -8, -10, -12
9, 7, 5, 3, 1, -1, -3, -5
3 4 Three is less than four
4 3 Four is greater than three