Number and Operations in Base Ten
Numbers beyond a thousand
Read, write, compare and round four-digit numbers.
Past a thousand, nothing new happens — a fourth column simply opens to the left of the hundreds. Each column is worth ten of the one on its right, so in 4,725 the 4 is worth four thousand, the 7 is worth seven hundred, the 2 is worth twenty and the 5 is worth five. The digit and its column together are what make the value; the same digit 5 is worth five in one place and five thousand in another.
Zero holds a column open
Four thousand and sixty has no hundreds, and it is still written 4060 rather than 460. The zero is not nothing — it is the thing keeping the 6 in the tens column instead of letting it slide across into the hundreds.
Worked example
Which is larger, 8,309 or 8,390?
Compare the thousands: 8 and 8.
Start from the left, because a thousand outweighs everything to its right put together.
Try it together
Now let us round 3,482 to the nearest hundred together.
Rounding means picking whichever landmark number the number sits closest to.
1.Which hundred comes just below 3,482?
Have a play
This line runs from four thousand to five thousand, and only every second tick is labeled. Find the numbers in between and see how far along each one sits.
Tap anywhere on the line.
Have a go
Have a go on your own: round 6,748 to the nearest hundred.
Hint: Look only at the tens digit, and ask whether it reaches 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.