Look at the digit to the right of the tens digit. If it is 5 or more, add one to the digit and add zeros in the end. Otherwise it will be 4 or less and so leave the number alone.
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round to the nearest ten thousandth 44.24862486
96 round to the nearest ten=100
300
645 rounded to the nearest ten would simply be 650.
9.72 to the nearest ten is 10.