680000
670000
8000000000 or 8491038000
8 thousandths
10
678000
Sometimes it is advantageous to express a value in round numbers. To round to a particular place, look at the digit immediately to the right of the one you want to round to. If that digit is 4, 3, 2, 1 or 0, zero it and everything to the right of it out. If that digit is 5, 6, 7, 8 or 9, increase your target digit by one and zero everything to the right of it out.
8000000000 or 8491038000
8 thousandths
10
678000
Write the value of the underlined digit in short word form 456,120,781 if the underlined number is 5?
Sometimes it is advantageous to express a value in round numbers. To round to a particular place, look at the digit immediately to the right of the one you want to round to. If that digit is 4, 3, 2, 1 or 0, zero it and everything to the right of it out. If that digit is 5, 6, 7, 8 or 9, increase your target digit by one and zero everything to the right of it out.
None of the digits has been underlined, so it could be: 8 = eight thousands 3 = three hundreds 0 = zero [tens] 5 = five ones
how many times as great is the underlined 4 as the 8 that is not underlined? 643 234
how many times as great is the underlined 4 as the 8 that is not underlined? 643 234
If the end digit is 1, 2, 3 or 4 you round down. If the end digit is 5, 6, 7, 8 or 9 then you round up. If the end digit is 0 it is already rounded.
This would have been easier if you showed us the underlined digit but there is a 5 in the thousands place, a 2 in the hundreds place, an 8 in the tens place and a zero in the ones place, representing (respectively) five thousand, two hundred eighty.
As the digit after the decimal point is 8, we round up, to give 5 as the answer.