Estimating Sums and Differences in Mathematics

This video tutorial for fourth graders covers the concept of estimating sums and differences using rounding. It explains the importance of estimation, how to round numbers to the greatest place of the smallest number, and provides practice problems to reinforce the skill. The tutorial emphasizes the use of estimation to check the reasonableness of answers in addition and subtraction problems.

What is the purpose of estimating in math?

• To find an exact answer

• To find an approximate answer

• To make numbers larger

• To make numbers smaller

Which place value should you round to when estimating sums?

• The hundreds place

• The greatest place value of the smallest number

• The smallest place value of the largest number

• The tens place

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If you have the numbers 4360, 654, and 1207, to which place value should you round?

• Units place

• Tens place

• Hundreds place

• Thousands place

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CCSS.3.NBT.A.1

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What is 4360 rounded to the nearest hundreds place?

• 4500

• 4600

• 4400

• 4300

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CCSS.3.NBT.A.1

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What is 654 rounded to the nearest hundreds place?

• 750

• 700

• 650

• 600

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CCSS.3.NBT.A.1

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What is 1207 rounded to the nearest hundreds place?

• 1350

• 1300

• 1250

• 1200

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What is the estimated sum of 4400, 700, and 1200?

• 6400

• 6300

• 6200

• 6500

What is 186,491 rounded to the nearest ten thousands place?

• 180,000

• 190,000

• 210,000

• 200,000

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

What is 44,786 rounded to the nearest ten thousands place?

• 40,000

• 45,000

• 50,000

• 55,000

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CCSS.3.NBT.A.1

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Why is estimation important in math?

• To check if your answer is reasonable

• To make numbers look nicer

• To confuse others

• To avoid doing actual calculations