Rounding Whole Numbers: Tens and Hundreds

The video tutorial introduces rounding numbers using a hill analogy, where numbers are visualized as cars driving up a hill. The halfway point is emphasized as a key marker for rounding decisions. The tutorial covers rounding smaller numbers, such as 10 to 20, and extends the concept to larger numbers, like 100 to 200. It concludes with a set of rounding rules and a chant to aid quick rounding without visual aids.

What is the halfway mark between 10 and 20?

• 15

• 12

• 10

• 20

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CCSS.5.OA.B.3

If you stop at 14 on the hill, to which number would you round down?

• 5

• 10

• 20

• 15

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CCSS.3.NBT.A.1

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Stopping at 18 on the hill, which number would you round up to?

• 10

• 25

• 15

• 20

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CCSS.3.NBT.A.1

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What happens if you run out of gas at 15 on the hill?

• Stay at 15

• Round to 10

• Round to 5

• Round to 20

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CCSS.3.NBT.A.1

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What is the halfway point between 100 and 200?

• 150

• 100

• 175

• 200

If you reach 183 on the hill, to which number would you round?

• 100

• 150

• 200

• 250

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CCSS.3.NBT.A.1

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According to the rounding chant, what should you do if the tens place is 4?

• Stay the same

• Round down

• None of the above

• Round up

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CCSS.3.NBT.A.1

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What does the tens place tell you when rounding to the nearest hundred?

• The number to add

• Nothing

• The exact number to round to

• Whether to round up or down

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CCSS.3.NBT.A.1

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What is the correct rounding for a number with a tens place of 9?

• Stay the same

• Round down

• None of the above

• Round up

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CCSS.3.NBT.A.1

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If the tens place is 0, what should you do according to the chant?

• Round down

• Add ten

• Round up

• Stay the same

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CCSS.3.NBT.A.1

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