500
500
639.0
500
0.1127
0.0664
639.497 rounded to the nearest tenth is 639.5. When the tenths digit is less than 5 the number is rounded down. When the tenths digit is 5 or more the number is rounded up. In this case the tenths digit is more than 5, so you round up.
497 is composite.
40,000.36,497 is closer to 40,000 than to 30,000 (which are the multiples of 10,000 either side of the number). Therefore it is equal to 40,000 to the nearest 10,000.
There are 25.4 millimetres in one inch. Therefore, rounded to two decimal places, 497 millimetres is equal to 497/25.4 = 19.57 inches.
To the nearest hundred thousand, 6500000
Ah, what a happy little question. When we round 500 to the nearest ten, it stays the same because it's already a multiple of ten. So, 500 rounded to the nearest ten is still 500. Just like a tree standing tall and proud, 500 remains unchanged and beautiful.