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To round a number to one decimal place means we are going to either round the first digit after the decimal point up (add 1 to it) or down (leave it as it is).
To determine whether we round it up or down we have to look at the digit to its immediate right. We then ask, "is this digit equal to or greater than 5?". If it is then we round up, else we round down.
In this example, the first digit after the decimal point is "9". The next digit (i.e. to its immediate right) is "4". As 4 is less than 5 we round down and leave the "9" as it was. Therefore this number is written as 209.9 to one decimal place.
Note: Another way to think about this is that what we are actually asking is whether 209.942 is closer to 209.9 or 210.0 (the answer is that it is closer to 209.9).
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You are 9 how oldd will you be in 2099?
I will be 98 in 2099 because I am 0 now.
What day of the week is September 5Th 2099?
September 5, 2099, is a Saturday.
What will you be in 2099?
dead.
What is 7.544 rounded to 1 dp?
7.5
What equals 104?
There are infinitely many possible answers. 52 + 52, 51 + 53, 50 + 54, ... ,1 + 103, 0 + 104, -1 + 105, ... : there are infinitely many such pairs. Then consider numbers to 1 decimal place: 51.9 + 52.1, 51.8 + 52.2, 51.7 + 52.3, ... : again, infinitely many pairs. and then 2 dp: 51.99 + 52.01, 51.98 + 52.02, ... then 3 dp, 4 dp, 5 dp, all the way to infinitely many dp. Next, consider triplets: 34 + 35 + 35, 34 + 34 + 36, 34 + 33 + 37 and so on. Again, with 1 dp, 2 dp, and on and on. Then start with multiplication. 1*104, 2*52, 3*34.66..., 4*26 etc and again with 1 dp, 2 dp, and so on. Then you have other, algebraic functions. But I hope that by now, you have got the point!
