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What does addition rule same sign mean?
The sum of a set of addends whose sign is the same is the sum of the absolute values of the addends with the same sign as the addends.
Why can you change the order of the addends in the commutative property?
This is possible because the order of the addends does not matter. For example, 3+8 is the same as 8+3. No matter how you list the addends, the sum will always be the same.
When all addends are about the same what can you use to estate their sum?
If all addends are the same, or very near the same, you can take one of the addends and multiply it by the number of addends that exist, and you have the sum. For example: 100 + 101 + 99 + 102 + 100 + 103 + 98 = ? In this case, all addends are close to 100, and there are 7 of them. So, you can approximate the sum by saying: 100 * 7 ...which is 700.
What is assosiative property of addition?
You can change the grouping of the addends and the sum will stay the same
What are an addition sentence that uses the same digit for both addends and the sum?
0+0 = 0
