the answer is 250
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200+100
The ballpark estimate of 245 can be rounded to 250 for simplicity. When considering the addition of a number, you would add that rounded figure. For example, if you're adding 20, you could estimate 250 plus 20, which equals 270. This method helps in quickly assessing the sum without precise calculations.
245'
245 * 245 = 60025
x+y=245 x=0-245 y=0-245