Year 4 Maths – Round to 10, 100, and 1000 KS2 Revision

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.