Posted by Peter on 9th January 2008

Free Y6 maths worksheet: Approximate answers by rounding

countingThis maths worksheet is a real test of understanding. Remember these key facts about rounding numbers:
Numbers to the nearest 10

When rounding to the nearest 100 the key figure is the tens digit. If the tens digit is 5 or above, round up. If it is below 5 round down.

Eg

279 is 300 to the nearest 100

249 is 200 to the nearest 100

(Note that it does not matter what the units digit is, it is the TENS digit that must be looked at.)

Numbers to the nearest 1 000

When rounding to the nearest 1 000 the key figure is the hundreds digit. If the hundreds digit is 5 or above, round up. If it is below 5, round down.

Eg

2 750 is 3 000 to the nearest 1 000.
2 199 is 2 000 to the nearest 1 000

(Note that it does not matter what the tens or units digits are, it is the HUNDREDS digit which must be looked at.)

Be careful that when rounding, children do not write:
‘2 345 = 2 000’
because 2 345 does not equal 2 000.

2 345 = 2 000 ‘to the nearest 1 000’ should always be added, or it can be written: 2 345 2 000

Rounding larger numbers

Larger numbers can be rounded in just the same way as above, always referring to the digit below the one you want to round.
Eg rounding to a million, look at the hundred thousand digit:

2 345 456 is 2 000 000 (two million) to the nearest million

2 987 654 is 3 000 000 (three million) to the nearest million

Free Y6 maths worksheet: Approximate answers by rounding (pg 2)

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