Each one of them is smaller than 100.
So 4 of them will be less than 4 lots of 100 or 400.
To prove that statement:
Suppose the 4 numbers are a, b, c and d.
Each of them is less than 100.
a < 100 so a = 100 - w for some positive number w.
Similarly, b = 100 - x; c = 100 - y; and d = 100 - z where x, y and z are also positive numbers.
Adding these 4 together,
a + b + c + d = 100 - w + 100 - x + 100 - y + 100 - z
= 400 - (w + x + y + z)
Now each of w, x, y and z is positive. Therefore, w+x+y+z is positive (the set of positive numbers is closed under addition).
So a + b + c + d = 400 - some positive number
ie a + b + c + d < 400
404
When rounding in the hundreds, you round when the tenths digit is greater than or equal to 5. In this case, 7 isgreater than 5, so you will round the ones digit up to the next- the answer is 400.(400)
537
400
I would just call it a "400-digit number".
When rounding to the nearest 10, you look at the last digit and if it is greater than or equal to 5, then you add one to the next to last digit and make the last digit 0. If it is less than 5 then you simply make the last digit 0. Thus 393 rounds to 390 while 395 becomes 400.
Four: 516,561,615 & 651.
All of the four-digit multiples of 400 end in 00.
It is the first or leftmost digit: 4.
To round 351 to the nearest hundred, you need to look at the tens digit, which is 5 in this case. Since 5 is equal to or greater than 5, you round up the hundreds digit by 1. Therefore, 351 rounded to the nearest hundred is 400.
400 times greater
400 yards is greater than 400 meters. One yard is equivalent to 0.9144 meters, so 400 yards would be approximately 365.76 meters.