Rounding 2-Digit Numbers to the Nearest Ten 3-23

Use an open number line and bar model to determine if a number is closer to the number of tens it has, or 1 more ten. What's 23 rounded to the nearest ten? The nearest multiples of ten are 20 and 30 – 2 tens and 3 tens. Halfway between 20 and 30 is 25. Since 23 is less than 25, it's closer to 2 tens. Round down to 20.

 
 

1. Learn

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Use an open number line and bar model to determine if a number is closer to the number of tens it has, or 1 more ten. What's 23 rounded to the nearest ten? The nearest multiples of ten are 20 and 30 – 2 tens and 3 tens. Halfway between 20 and 30 is 25. Since 23 is less than 25, it's closer to 2 tens. Round down to 20.

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2. Practice

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Lesson
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Lesson
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3. Apply

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POD
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Want more? Try Rounding Rocks! B!