Mr Golan asked the class to see if they could find the sum of the first 50 odd numbers. As everyone settled down to their addition, Julia ran to him and said, "The sum is 2,500." Mr Golan thought, "Lucky guess," and gave him the task of finding the sum of the first 75 odd numbers. Within 20 seconds, Julia was back with the correct answer of 5,625.
How did she do this?
How did she do this?
I Believe she may have done
ReplyDelete151 + 1
149 + 3
147 + 5
But that is what I think
And she also did
ReplyDelete152 x 75