Anything between 3.5 and 4.49
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up, so you would round 3.5 to 4.
4050 to 4149
keep the first four numbers then round up or down the last number. in this case i would keep 3499, then the last 9 would round up, making the number 35000. For only 4 sig numbers, you would have 3500.
14, it doesn't matter which way round the numbers are!
to round, look at the digit immediately after the place value you are rounding to; thus, if you are rounding to hundreds, you look to the tens column. the digit "4" is in the tens column. numbers 4 and under round down; numbers 5 and higher round up. therefore, 147.32 rounded to the nearest hundred is 100