690
690
690
690
690
690
Rounded to the nearest ten, 691 becomes 690 as the last number is less than five.
690
690
To round 689 to the nearest ten, you look at the digit in the tens place, which is 8. Since 8 is greater than or equal to 5, you round up. Therefore, 689 rounded to the nearest ten is 690.
690
690