Year 4 Maths – Round to 10, 100, and 1000 KS2 Revision
What you need to know
Things to remember:
- Use your finger to find the number you’re rounding.
- We look at the number on the RIGHT to see how it rounds.
- If we have 4 or less, the number stays the same.
- If we have 5 or more, the number goes up by 1.
- The numbers to the right of the one we’re rounding become 0.
Let’s remind ourselves how we round to the nearest 10.
We find the tens and then look to the right.
If the units are 4 or less, the number stays the same.
If the units are 5 or more, we round up.
Number Rounded
22 20
31 30
65 70
38 49
But how would we do something like “Round 3256 to the nearest hundred”? We do this in 4 steps.
Step 1: Find the place value we are rounding to.
We are rounding to the nearest hundred, so that is the 2.
3256
Step 2: Look at the number to the right of the one we’re rounding.
3256
Step 3: Round the number.
The number next to the 2 is a 5, which means the 2 goes up by 1.
33_ _
Step 4: Make everything to the right of the number you rounded 0s.
3300
We do the same when rounding to the nearest thousand.
Round 5477 to the nearest thousand.
Step 1: Find the place value we are rounding to.
We are rounding to the nearest thousand, so that is the 5.
5477
Step 2: Look at the number to the right of the one we’re rounding.
5477
Step 3: Round the number.
The number next to the 5 is a 4, which means the 5 stays the same.
5 _ _ _
Step 4: Make everything to the right of the number you rounded 0s.
5000
5477 rounded to the nearest thousand is 5000.
Example Questions
Question 1: Round 7455 to the nearest hundred
Step 1: Find the place value we are rounding to.
We are rounding to the nearest hundred, so that is the 4.
7455
Step 2: Look at the number to the right of the one we’re rounding.
7455
Step 3: Round the number.
The number next to the 4 is a 5, which means the 4 goes up by 1.
75 _ _
Step 4: Make everything to the right of the number you rounded 0s.
7500
7455 rounded to the nearest hundred is 7500.
Question 2: Round 6283 to the nearest thousand.
Step 1: Find the place value we are rounding to.
We are rounding to the nearest thousand, so that is the 6.
6283
Step 2: Look at the number to the right of the one we’re rounding.
6283
Step 3: Round the number.
The number next to the 6 is a 2, which means the 6 stays the same.
6 _ _ _
Step 4: Make everything to the right of the number you rounded 0s.
6000
6283 rounded to the nearest thousand is 6000.