Rounding Whole Numbers

Stage 5 of 23 Strand 1 of 9 2 lessons

2 illustrated lessons, each teaching the why before the how.

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Rounding to the Nearest Ten #

Round to the nearer ten; halfway rounds up.

A number rounds to whichever ten is nearer, and an exact halfway rounds up

47 sits above the halfway mark of 45 and rounds up to 50.

42 is below the halfway mark of 45 and rounds down to 40.

45 is on the halfway mark, so it rounds up to 50.

Now you

Round 143 to the nearest ten

Round 732 to the nearest ten

One digit to the right decides up or down.

The single digit to the right of the rounding place decides up or down

347 is below the halfway mark of 350 and rounds down to 300.

3600 is above the halfway mark of 3500 and rounds up to 4000.

2500 is on the halfway mark, so it rounds up to 3000.

Now you

Round 135 to the nearest hundred

Round 4671 to the nearest thousand