It is 600It is 600It is 600It is 600
How about: 23*28 = 644 as one example
1.087
There are many ways to do it. You could use long division, plug it into a calculator, count multiples of 23 until they reach 644. One way to work it out is to roughly guess and then correct your answer. For example, here's how I work it out in my head: I know that 644 is roughly 30 times greater than 23. Not exactly, but roughly. 30 * 23 = 690, and 690 is 46 greater than 644. 46 / 23 = 2, so the answer is 30 - 2, or 28.
16
It is 640 because 4 is less than 5
It is 600It is 600It is 600It is 600
It is 644 because .4 is less than .5
The answer will depend on the degree to which the number is rounded. Without any indication of that, it is not possible to answer the question sensibly.
It is 644 because .4 is less than .5
644
600
601, 625, 640, 644, 649
1288
For the values: 46 and 28 the LCM is: 644
You do not need to estimate. The answer is exactly 644.
All multiples of 644, which is an infinite number.