You can think of it like estimating mathematically.
Take the number 813. 265. You could round it to the hundred, ten, one, tenth, or hundredth place.
In the number 813. 265, let’s say you were rounding to the tenth place. This means you’d look at the hundredth place.
For example, if you’re rounding 0. 74 to the nearest tenth place, you’d look at the next digit down (the 4). Since this number is below 5, you keep the 7 as-is, leading to an answer of 0. 7.
Take the number 35. If we were to round it to the nearest tens place, we’d look at the next smallest place value (the 5). To round up, we’d add 1 value (1 tens place) to the 3. So 35 rounded to the nearest tens place is 40.
The less precise number required, the more you can round (to higher place values). More precise numbers should be rounded to lesser place values. If you are rounding a fraction, convert it to a decimal before rounding.
Though 5 is in the middle of the numbers 1-9, it is generally agreed that the digit 5 will require a number before it to be rounded up. This may not apply to your teachers when they submit final grades, though![10] X Research source Standard bodies like the NIST adopt a different method: When the rounding digit is 5, look at the digits to the right of it. If any subsequent digit is different from 0, round up. If all subsequent digits are 0 or there are no more digits, then round up if the rounding digit is odd and round down if the rounding digit is even. [11] X Research source
By keeping it the same and changing all numbers to its right to 0, the final rounded number is less than the original beginning number. Thus, the number, as a whole, goes down. The above two steps are represented on most desktop calculators as 5/4 rounding. There is usually a slide-switch you can move to the 5/4 rounding position to achieve these results.
12 –> 10 114 –> 110 57 –> 60 1,334 –> 1330 1,488 –> 1490 97–> 100
7,891 – > 7,900 15,753 –> 15,800 99,961 –> 100,000 3,350 –> 3,400 450 –> 500
8,800 –> 9,000 1,015 –> 1,000 12,450 –> 12,000 333,878 –> 334,000 400,400 –> 400,000
1. 239 has 4 significant digits 134. 9 has 4 significant digits . 0165 has 3 significant digits
1. 239 rounded to 3 significant digits is 1. 24. This is because the digit to the right of the third digit, 3, is a 9, which is 5 or more. 134. 9 rounded to 1 significant digit is 100. This is because the digit to the right of the digit in the hundreds place, or the first digit, 1, is 3, which is less than 5. 0. 0165 rounded to 2 significant digits is 0. 017. This is because the second significant digit is 6, and the number to the right of it, 5, makes it round up.
13. 214 + 234. 6 + 7. 0350 + 6. 38 = 261. 2290 See that the second number, 234. 6, is only accurate to the tenths place, or four significant digits. Round the answer so that it is only accurate to the tenths place. 261. 2290 becomes 261. 2.
16. 235 × 0. 217 × 5 = 17. 614975 Notice that the 5 number only has one significant digit. This means that your final answer will only have one significant digit as well. 17. 614975 rounded to one significant digit becomes 20.
Older models of the TI calculator may have slightly different functions or menus.
If you’re rounding a fraction, convert it to a decimal first.
Your calculator will look something like this: round(6. 234, 1). If you don’t specify the number of decimal places you’d like to round to, you’ll get an error code or a very strange fraction.
The spot that you click will be the cell that the rounded number appears.
It’s a simple formula, but make sure you don’t leave any of it out!
For example, if you clicked the A1 cell, your fx box will look like this: “=ROUND(A1
If you want to round to the next multiple of 10, type in -1.
Your answer will show up in the cell you originally clicked on.
