Number and Operations in Base Ten
Numbers up to six digits
Read, compare, order and round whole numbers up to six digits.
Every digit in a number has a job, and the job depends on where it stands. Reading from the right, the columns are ones, tens, hundreds, thousands, ten thousands and hundred thousands. Each column is worth ten of the one to its right.
The rule
A digit's value is the digit multiplied by its column. The 4 in 40000 and the 4 in 400 are the same digit doing very different work.
Worked example
What is the 6 worth in 465018?
Count the columns from the right: 8 ones, 1 ten, 0 hundreds, 5 thousands, 6 ten thousands, 4 hundred thousands.
Naming them from the right is safer than guessing from the left, because the right-hand end never moves.
Have a play
This line runs from zero to one hundred thousand in steps of ten thousand. Look at where each number falls, and how far apart the steps are.
Tap anywhere on the line.
Try it together
Let us round 63784 to the nearest thousand together.
Rounding asks a simple question: which thousand is it nearer to?
1.63784 sits between two thousands. The lower one is 63000. What is the higher one?
Have a go
Have a go on your own: round 28409 to the nearest thousand.
Hint: Look at the hundreds digit and ask whether it has reached 5.
Ready to practice?
Eight questions on what you have just read. Nothing is timed, and you can play as many times as you like.