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3nbt1 Worksheets

Number and Operations in Base Ten Use place value understanding and properties of operations to perform multi-digit arithmetic. 1Use place value understanding to round whole numbers to the nearest 10 or 100.

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3nbt1 Worksheets - Finding Sum with Rounding worksheet

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Finding Sum with Rounding

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Practice rounding numbers to a nearby ten or hundred to make them easier to add in your head.
Learn to spot “friendly” numbers you can make by rounding before you add.
Estimate the total of two numbers quickly without doing exact pencil-and-paper addition.
Decide whether to round up or round down by looking at the digit in the next place.

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3nbt1 Worksheets - Finding Sums with Rounding worksheet

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Finding Sums with Rounding

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Practice rounding numbers to the nearest ten or hundred.
Decide which place value to round to based on what the problem asks.
Add the rounded numbers to find an estimated total.
Read word problems and pick out the numbers that need to be added.

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3nbt1 Worksheets - Estimating Sums and Differences by Rounding (Word Problems) worksheet

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Estimating Sums and Differences by Rounding (Word Problems)

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Round each number to the given place value before adding or subtracting.
Estimate sums and differences to the nearest ten, hundred, thousand, or ten thousand.
Recognize when an estimate is useful instead of an exact answer.

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3nbt1 Worksheets - Estimating Products (×) worksheet

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Estimating Products (×)

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Practice rounding numbers to make multiplication problems easier to do in your head.
Estimate a product by multiplying the rounded numbers.
Use compatible numbers (easy-to-multiply numbers) to get a quick estimate.
Choose the best estimate when there are several possible answers.

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3nbt1 Worksheets - Finding Rounding Amount worksheet

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Finding Rounding Amount

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Figure out which numbers could round to a given number at a certain place value.
Use place value to decide the cutoff point where a number rounds up or rounds down.
Find the smallest and largest numbers that would round to the same result.

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3nbt1 Worksheets - Rounding to Hundreds with Numberline worksheet

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Rounding to Hundreds with Numberline

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Round a number to the nearest hundred by deciding which hundred it is closest to.
Use a number line to see where a number falls between two hundreds.
Find the midpoint between two hundreds and use it to choose which way to round.

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3nbt1 Worksheets - Rounding to Tens with Numberline worksheet

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Rounding to Tens with Numberline

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Round a whole number to the nearest ten.
Use a number line to see which two tens a number falls between.
Decide which ten is closer by comparing the distance on the number line.
Handle halfway cases (numbers ending in 5) by rounding up to the next ten.

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3nbt1 Worksheets - Rounding to Tens & Hundreds worksheet

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Rounding to Tens & Hundreds

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Round whole numbers to the nearest ten or hundred.
Use the ones and tens digits to decide whether to round up or down.

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