AU1 REVIEW

23 x 0 =

• 23

• 0

1 x 41 =

• 1

• 40

• 41

12 x 1 = 12 and 1 x 43 = 43

What is right conclusion from this examples?

• Any number you multiply to any number is 1.

• Any number you multiply to 1 is the number it self.

12 x 0 = 0 and 0 x 43 = 0

What is right conclusion from this examples?

• Any number you multiply to zero the answer is 0.

• Any number you multiply to a number is nothing.

Tina and her 5 friends need to cut a pan of brownies into pieces. She cuts 6 even columns and 12 even rows into the pan. How many brownies do they have?

WHAT IS THE UNNECESSARY DETAIL IN THE PROBLEM?

• 5 friends

• 6 even columns

• 12 even rows

• none

Tina and her 5 friends need to cut a pan of brownies into pieces. She cuts 6 even columns and 12 even rows into the pan. How many brownies do they have?

WHAT IS THE FINAL ANSWER?

• 70 brownies

• 71 brownies

• 82 brownies

• 72 brownies

A clothing company has 4 different kinds of sweatshirts and 6 different kinds of hats. Each year, the company makes 600 of each kind of sweatshirt. How many sweatshirts does the company make each year?

WHAT IS THE UNNECESSARY DETAIL IN THE PROBLEM?

• 4 different kinds of sweatshirts

• 6 different kinds of hats

• 600 of each kind of sweatshirt

• none

A clothing company has 4 different kinds of sweatshirts and 6 different kinds of hats. Each year, the company makes 600 of each kind of sweatshirt. How many sweatshirts does the company make each year?

WHAT IS THE FINAL ANSWER?

• 2400 sweatshirts

• 3600 hats

• 6000 items

Study the solutions of the students.

Hannah: 12 x 9 = 108

Andee: 12 x 9 = 180

Who made a mistake in her answer?

• Hannah

• Andee

Study the solutions of the students.

Hannah: 12 x 9 = 108

Andee: 12 x 9 = 180

What is the error in her answer?

• 1 is in the wrong place value.

• 8 is in the wrong place, it should be in the hundreds place.

• 0 should not be in the solution.

• 0 and 8 are misplaced.