Neighbour numbers and round numbers
You learn to find the number just before and just after a number, and the round tens and hundreds.
How to work it out
- The neighbour before is 1 less: take 1 away.
- The neighbour after is 1 more: add 1.
- With tens and hundreds you look at the round number before and after.
248
- Look at the number 248.
- Take away 1 to get the number before: 248 − 1 = 247.
- Add 1 to get the number after: 248 + 1 = 249.
- The neighbouring numbers are 247 and 249.
Th1,000
—
H100
2
T10
4
O1
8
200 + 40 + 8=248
More examples
65
- Find the round ten just below 65: that is 60.
- Find the round ten just above 65: that is 70.
567
- Find the hundred just below 567: that is 500.
- Find the hundred just above 567: that is 600.
Th1,000
—
H100
5
T10
6
O1
7
500 + 60 + 7=567