640
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Well, isn't that a happy little number! When we round 638 to the nearest 10, it becomes 640. See how it just smoothly transitions to the nearest 10, like a soft cloud floating in the sky? Just a little adjustment to make everything feel just right.
When rounding 638 to the nearest 10, you look at the digit in the tens place, which is 3. Since 3 is less than 5, you round down. Therefore, 638 rounded to the nearest 10 is 630.
Oh honey, 638 rounded to the nearest 10 is 640. It's like giving it a little nudge up the number line. Easy peasy, lemon squeezy.
600
10 because 8 is to small to have this and 10 is the first ten there is
Rounded to the nearest ten it is 10 but rounded to the nearest tenth it is 12.6
70
420