Well, let's take a look at the number 617. If we focus on the tens place, we see that there are 6 tens in 617. Each place value is like a little friend waiting to be counted and appreciated. Just remember, numbers are just happy little accidents waiting to bring joy to our mathematical world.
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tens
10
40
number 8 (without decimals, the second number from the end is always in the ten's place)
660. remember when rounding to the nearest ten your lowest non zero number will be in the tens place and you will look at the ones place to decide whether or not to round up. If the ones place is 5 or above, round up in the tens place. If the ones place is 0-4 keep the remaining tens place number.