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When rounding numbers to any multiple of 10 (10, 100, 1000, etc), we look at the digit in the column to the right of the number we are rounding to.
Rounding to 10 - look at the ones column 16
Rounding to 100 - look at the tens column 261
Rounding to 1,000 - look at the hundreds column 5,623
If the digit we are looking at is either 0 1 2 3 4 we round down.
If the digit is either 5 6 7 8 9 we round up.
Let's have a look at a few examples before you try some.
Round these numbers to the nearest 10
15 - the digit to the right of the tens column is a 5 so we round up to 20.
12 - the digit to the right of the tens column is a 2 so we round down to 10.
Round these numbers to the nearest 100
272 - the digit to the right of the hundreds column is a 7 so we round up to 300
649 - the digit to the right of the hundreds column is a 4 so we round down to 600
Round these numbers to the nearest 1,000
9,999 - the digit to the right of the thousands column is a 9 so we round up to 10,000
6,497 - the digit to the right of the thousands column is a 4 so we round down to 6,000
Round this number to the nearest 1,000
2199
Even though the tens and ones columns are 9s, we still round down because the hundreds digit is a 1
Now, why don't you have a go at rounding some numbers!
