When rounding to the nearest whole number, the crucial digit to look at is the tenths digit. If it is 5 or more then the units will round up; if it is less than 5 the units will remain the same.
When rounding to the nearest tenth the crucial digit to look at is the hundredth.
Difficulties can occur when a number that needs rounding up also changes the units and possibly the tens digits. For example 9.95 rounded up to the nearest tenth is 10.
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