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We can round numbers to 10,000 and 100,000
Year 5 Unit 1c
What we are learning:
- Once we are confident with numbers we can round them to 10,000 and 100,000. This is useful in lots of mental calculations to get ‘approximate’ answers, or estimations.
- Remember the rule for rounding – if the number we are rounding is half way or more towards the next rounded number we round UP.
- We can round large numbers to different degrees of accuracy
If we start with the number 7,429
We can round 7,429 to the nearest 10 = 7,430
We can round 7,429 to the nearest 100 = 7,400
We can round 7,429 to the nearest 1,000 = 7,000
- We can round very large numbers in the same way
If we start with the number 264,788
We can round 264,788 to the nearest 10 = 264,790
We can round 264,788 to the nearest 100 = 264,800
We can round 264,788 to the nearest 1000 =265,000
We can round 264,788 to the nearest 10,000 = 260,000
We can round 264,788 to the nearest 100,000 = 300,000
Activities you can do at home:
Try rounding the numbers on the activity sheet.
When you are out and about try looking at numbers and rounding them in a way that makes sense:
If you look at a computer that costs £549 ask your child to round the amount to the nearest £10
If you look at a car that costs £23,699 ask your child to round it to the nearest £100 or the nearest £1000
Good questions to ask:
What is that number rounded to the nearest ……?
Why is it helpful to round numbers sometimes?
If your child:
Gets confused when rounding large numbers
Start by rounding to the nearest 1 or 10 so that you only have to look at the units and tens column of the number you are rounding. Build up confidence before extending to rounding to 1000 and more.
Talk about the value of the numbers you are rounding – this will help and show you where the misunderstanding is happening.