Estimating Multiplication in 5th Grade Math

This video tutorial focuses on lesson 3.2, which is about estimating products by rounding numbers to the highest place value and then multiplying them. The teacher explains the steps involved in estimation, including rounding numbers and counting zeros in the product. Several examples are provided to illustrate the process, such as estimating the products of 23 x 38, 121 x 12, and 72 x 26. The video concludes with instructions for students to submit their assignments on Schoology and complete additional problems on Savas.

What is the first step in estimating a product?

• Multiply the numbers directly

• Add zeros to the numbers

• Divide the numbers by 10

• Round each number to the highest place value

Tags

CCSS.4.NBT.B.5

When rounding the number 462, to which place value should it be rounded?

• Thousands

• Hundreds

• Units

• Tens

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

If you are asked to estimate the product of 23 and 38, what should 23 be rounded to?

• 10

• 20

• 30

• 40

Tags

CCSS.4.NBT.B.5

After rounding 23 to 20 and 38 to 40, what is the estimated product?

• 900

• 800

• 700

• 600

Tags

CCSS.4.NBT.B.5

What is the largest place value in the number 121?

• Units

• Thousands

• Tens

• Hundreds

Tags

CCSS.4.NBT.A.1

When rounding 121 to the nearest hundred, what is the result?

• 200

• 130

• 120

• 100

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

What is the estimated product of 121 and 12 after rounding?

• 1200

• 1300

• 1100

• 1000

Tags

CCSS.4.NBT.B.5

When estimating the product of 72 and 26, what should 72 be rounded to?

• 80

• 70

• 60

• 90

Tags

CCSS.4.NBT.B.5

After rounding 72 to 70 and 26 to 30, what is the estimated product?

• 2300

• 2200

• 2100

• 2000

Tags

CCSS.4.NBT.B.5

Which of the following is one of the example problems given for the assignment?

• 513 times 19

• 100 times 20

• 50 times 30

• 200 times 40

Tags

CCSS.5.NBT.B.5