7.446 is rounded to 7.45.
Look at the number to the right of the second decimal place (or the hundredth place), if:
x>= 5 then round up,
x<5 then round down.
Since 6 is >= 5 we round 4 up to 5.
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The Hundreds place for the 2 before the decimal but the hundredths place for the 2 behind the decimal
4.61 is at 2 decimal places To one decimal place it is 4.6
1.556621881 rounded to zero decimal place = 2
2 tens
It is 3.69 rounded to two decimal places