Splitting the number at 1 decimal gives 4.5 | 29
The digit after the "|" is less than 5 and so just ignore it all and the answer is 4.5
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Go to the second decimal place; if it is less than 5; round down. If it is 5 or greater, round up. So, 1.51 rounded to 1 decimal place is 1.5.
3.3 rounded to 1 decimal place is 3.0.
You would round it up to 17.8
to round to one decimal point all you have to do is move the decimal point once to the right for example: 0.808 becomes 08.08
1.9