Mastering 2-Digit Multiplication with Arrays

What is the first step in using an array to multiply two-digit numbers?

• Break apart the numbers by place value

• Sum up the parts of the array

• Multiply the numbers directly

• Label the dimensions of the array

Tags

CCSS.4.NBT.B.5

What does the rectangle representing 20 by 10 equal to?

• 10

• 20

• 200

• 100

Tags

CCSS.4.NBT.B.5

How do you find the value of 20 times 6 in the array?

• By dividing 20 by 6

• By adding 20 six times

• By multiplying 10 by 6 and then doubling it

• By multiplying 20 by 6 directly

Tags

CCSS.4.NBT.B.5

What does the piece equal to 6 by 4 represent in the array?

• 20

• 32

• 24

• 28

Tags

CCSS.3.OA.A.1

What is the total sum of all pieces in the first example?

• 364

• 384

• 424

• 404

Tags

CCSS.2.NBT.B.7

In the second method, how is the number 16 broken down differently than the first method?

• Into 8 and 8

• Into 10 and 6

• It is not broken down

• Into 20 and 4

Tags

CCSS.2.NBT.B.5

What is the value of the rectangle that is 20 by 8 in the second example?

• 220

• 200

• 160

• 180

Tags

CCSS.4.NBT.B.5

What is the sum of 160 plus 160 plus 32 plus 32?

• 424

• 384

• 404

• 364

Tags

CCSS.3.NBT.A.2

CCSS.2.NBT.B.7

Why is using arrays to multiply beneficial?

• It requires less calculation.

• It provides a visual representation of the multiplication.

• It always gives the exact answer without needing to add.

• It is the only way to multiply two-digit numbers.

Tags

CCSS.4.NBT.B.5

How many different ways can you break apart the array to solve 24 times 16?

• Only one correct way

• Exactly two ways

• A few ways

• Many ways

Tags

CCSS.4.NBT.B.5