Strategies for 2-Digit by 1-Digit Multiplication

The video tutorial covers the concept of two-digit by one-digit multiplication, specifically focusing on a problem involving gym towels. It introduces the problem, explains the partial products method, and the standard algorithm for solving it. The video also highlights common mistakes students make and concludes with the correct solution.

How many towels does the gym use in one day?

• 14 towels

• 98 towels

• 686 towels

• 7 towels

Tags

CCSS.3.OA.A.3

How many groups of towels are used in a week?

• 14 groups

• 686 groups

• 98 groups

• 7 groups

Tags

CCSS.3.OA.A.3

What is the first step in the partial products method?

• Multiply the ones place

• Add the products

• Multiply the tens place

• Regroup the numbers

Tags

CCSS.4.NBT.B.5

What is the result of multiplying 9 (in the tens place) by 7?

• 63

• 630

• 56

• 686

Tags

CCSS.4.NBT.B.5

What is the total number of towels used in 7 days?

• 686 towels

• 98 towels

• 630 towels

• 56 towels

Tags

CCSS.3.OA.A.3

In the standard algorithm, where do you place the regrouped number?

• In the ones place

• Above the tens place

• In the tens place

• It is discarded

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What is the final answer using the standard algorithm?

• 686

• 636

• 630

• 56

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

How do you get an incorrect answer of 636?

• By adding incorrectly

• By dividing

• By subtracting

• By not regrouping

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

What incorrect method gives you 14 as an answer?

• Subtracting

• Dividing

• Adding

• Multiplying

Tags

CCSS.4.NBT.B.6

What incorrect method results in 91 as an answer?

• Dividing

• Adding

• Multiplying

• Subtracting

Tags

CCSS.4.NBT.B.6