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multiplication
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.
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.
an estimating technique in which the front digits of the addends are added and then the sum is adjusted for a closer estimate
Hm well you can use whole numbers. Now my boy do you get it? Get that brain working!