Why does 843,000 round to 840,000 rather than 850,000 when rounded to the nearest ten thousand

Because , thousand place number is less than five then it would be rounded down and ten thousand place number would be same and other numbers would be zero. 840,000

Step-by-step explanation:

Given :  843,000

To find : why does 843,000 round to 840,000 rather than 850,000 when rounded to the nearest ten thousand.

Solution: We have given  843,000.

Nearest ten thousand :

The ten thousand digit is 4 in 843,000.

Identify the smaller place digit 3 in 843,000.

We can see the number is less than five then it would be rounded down and ten thousand place number would be same and other numbers would be zero.

Number = 840,000

Note : If the Smaller place would be greater than 5 then ten thaousand place digit would increased by 1 and other digit would zero.

So, number  = 840,000

Therefore, Because , thousand place number is less than five then it would be rounded down and ten thousand place number would be same and other numbers would be zero.

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: