As the last digit is a 2, it will round down giving 64 as the answer.
To estimate 642 times 207, you can round each number to a more manageable figure. For example, round 642 to 600 and 207 to 200. Then, multiply the rounded numbers: 600 times 200 equals 120,000. This gives you a rough estimate of the product.
9.2 hours
The number 642 is not a prime number as it can be divided by 2 aswell as itself and one.
In today's notation 642 = DCXLII in Roman numerals
The number 642 in Roman numerals is represented as DCXLII. D represents 500, C represents 100, XL represents 40, and II represents 2. When combined, they form 642.
642 + 798 round the answer to the nearest thousand = 1440
0.0389
600
642 642
9.2 hours
640
642
The number 642 is not a prime number as it can be divided by 2 aswell as itself and one.
In today's notation 642 = DCXLII in Roman numerals
Nope, a 742 centerfire but no 642.
The prime factorization of 642 is 2 x 3 x 107.
This cannot be determined based on the number you provided. You must have at least two whole numbers to determine a greatest common factor.