Estimating Sums and Differences in Mathematics

The video tutorial covers the concept of estimating sums and differences by rounding numbers to make calculations easier. It includes examples such as Mario and Luigi's road trip, Justin's dog toy calculation, and a parakeet population comparison. The tutorial also highlights a common mistake in rounding through Matthew's example, emphasizing the importance of correct rounding techniques.

What does it mean to estimate a number?

• To find the exact value

• To find a number close to the exact value

• To divide the number

• To multiply the number

Tags

CCSS.4.NBT.B.5

What is the purpose of rounding a number?

• To find the exact value

• To change the value of a number to make it easier to work with

• To make the number smaller

• To make the number larger

Tags

CCSS.4.NBT.A.3

CCSS.3.NBT.A.1

If Mario drove 125 miles and Luigi drove 599 miles, what is the estimated total distance they drove?

• 600 miles

• 800 miles

• 700 miles

• 900 miles

When rounding 599 to the nearest hundred, what is the result?

• 500

• 800

• 700

• 600

Tags

CCSS.4.NBT.A.3

CCSS.3.NBT.A.1

Justin's dog chewed through 1338 balls and 8019 stuffed animals. What is the estimated total number of toys ruined?

• 9000

• 9300

• 9500

• 10000

Tags

CCSS.4.NBT.B.5

When rounding 1338 to the nearest hundred, what is the result?

• 1600

• 1500

• 1400

• 1300

Tags

CCSS.4.NBT.A.3

CCSS.3.NBT.A.1

A scientist believes there are 4984 small parakeets and 7939 large parakeets. What is the estimated difference in their numbers?

• 2000

• 4000

• 5000

• 3000

Tags

CCSS.5.OA.A.2

CCSS.5.OA.A.1

When rounding 7939 to the nearest thousand, what is the result?

• 10000

• 9000

• 8000

• 7000

Tags

CCSS.4.NBT.A.3

CCSS.3.NBT.A.1

What is the estimated sum of 8903 and 349?

• 9000

• 9200

• 9300

• 9400

In Matthew's work, what was the mistake he made while rounding?

• He added instead of subtracting

• He rounded to the nearest thousand instead of hundred

• He subtracted instead of adding

• He rounded to the nearest ten instead of hundred