To find the average of three numbers, you add them together and then divide by the total number of values. In this case, the sum of 657, 890, and 1240 is 2787. Dividing this sum by 3 (the total number of values) gives an average of 929. Therefore, the average of 657, 890, and 1240 is 929.
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1240
890
657 rounded to the nearest ten is 660. 657 rounded to the nearest hundred is 700.
894 to the nearest 10 = 890
There are 89 tens in 890.