Choosing the Best Method for 2-Digit Multiplication

This video tutorial covers lesson 3.6, focusing on choosing a multiplication method for two-digit factors. It reviews the partial products and regrouping methods, providing examples and comparisons. The video also includes practical applications, such as calculating SPF protection time and solving word problems. The tutorial concludes with a preview of the next lesson, which will focus on solving word problems using diagrams.

What are the two methods mentioned for multiplying two-digit factors?

• Partial products and regrouping

• Long division and short division

• Addition and subtraction

• Square roots and cube roots

Tags

CCSS.4.NBT.B.5

In the partial products method, what is the first step when multiplying 54 by 28?

• Add the partial products

• Multiply the tens place

• Estimate the product

• Multiply the ones place

Tags

CCSS.4.NBT.B.5

When using the partial products method, what is the result of multiplying 20 by 50?

• 200

• 100

• 1000

• 500

Tags

CCSS.5.NBT.B.5

In the regrouping method, what is the first step when multiplying 54 by 28?

• Multiply the tens place

• Add the partial products

• Estimate the product

• Multiply the ones place

Tags

CCSS.4.NBT.B.5

What is the estimated product of 54 and 28 using the regrouping method?

• 1000

• 2000

• 1500

• 2500

Tags

CCSS.4.NBT.B.5

How do you calculate the time Bob can stay in the sun using SPF 15 if he gets a sunburn in 12 minutes?

• Multiply 15 by 12

• Divide 15 by 12

• Add 15 and 12

• Subtract 12 from 15

Tags

CCSS.6.RP.A.3B

What is the estimated product of 15 and 12 when using partial products?

• 200

• 250

• 100

• 150

Tags

CCSS.4.NBT.B.5

How many hours is Bob protected from the sun if he is protected for 180 minutes?

• 3 hours

• 2 hours

• 5 hours

• 4 hours

Tags

CCSS.4.MD.A.1

How much did Sarah spend on fabric if she bought 14 yards at $24 per yard?

• $3360

• $240

• $400

• $336

Tags

CCSS.3.OA.D.8

How much change will Sarah receive if she pays with four $100 bills for fabric costing $336?

• $400

• $100

• $64

• $36

Tags

CCSS.7.EE.B.3