The two candidates are 300 and 400
300 is a "distance" of 49 away
400 is a "distance" of 51 away
So 300 is the nearest 100.
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You do not need a conjecture; you can calculate the answer. The answer is 10,100
The answer is the 100th triangular number so you can use the formula (n(n+1))/2.n = 100 so the sum is (100 x 101)/2 = 10100/2 = 5,050.
Add them all together then divide the sum by 100 (move the decimal point two places to the left).
You can round 98 up to the nearest ten, giving you 100, and 32 down to the nearest 10, giving you 30.This sum would make 100 x 30, which is 3000, just 136 shy of the actual answer.
Estimate by rounding to the nearest ten.​ Then, find the sum.221122plus+33554455​_​_The estimated sum is nothing.