209.9
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It depends how many decimal places or significant figures you are rounding to.Here's the general method for if you're rounding to 2 dp (decimal places);Look at the number in the 3rd dp spot. Is it 5 or above?If no, write the number with only 2 dp ignoring the 3rd dp number completely. If yes, you'll need to increase the number in the 2nd decimal place spot by 1, unless ...The 2nd dp number is a 9 (as it is in the above question). In that case you need to increase the 1st dp number by 1 and make the 9 a zero. Unless ...The 1st dp number is a 9 ..... etc. etc.So for our example;Rounding to;2 dp = 8.201 dp = 8.20 dp = 8
17.73 to 1 decimal place is 17.7
0.17
To 1 dp, 0.46 → 0.5
Infinitely many. Start with sums of two whole numbers: 5+4, 6+3, 7+2, 8+1, 9+0, 10+(-1), 11+(-2), ... and infinitely more. Then consider numbers to one decimal place (dp): 4.5+4.5, 4.6+4.4, 4.7+4.3, and infinitely more of those. And then numbers with 2 dp, 3 dp, ... infinitely many dp. Next, consider sums of 3 numbers, 4 numbers, 5 numbers, ... , infinitely many numbers - in each case using numbers with 1 dp, 2 dp, 3 dp, ... infinitely many dp. When you have done all those you can start with multiplications. And then move on to other mathematical operations.