Multiplication Review

What is multiplication?

• repeated subtraction

• repeated addition

• multiplication is its own thing

What is an array?

• An arrangement of objects

• It has rows and columns

• It is a strategy used for multiplication/division

• All of the above!

What is 5 x 9 = ?

• 35

• 40

• 42

• 45

What is 30 / 5 = ?

• 16

• 6

• 5

• 7

b x 3 = 12 . What is b?

• b = 4

• b = 5

• b is a letter...

• b = 9

Tags

CCSS.3.OA.A.4

What is a variable?

• A big word.

• A math word.

• A letter that represents an unknown number.

If you know that 7 x 2 = 14, then you know that...

• 2 x 7 = 14

• 14 / 2 = 7

• 14 / 7 = 2

• All of the above!

What is the area of a rectangle?

• The number of square units that fit inside of it.

• A region or part of town.

• The number of triangle units that fit inside of it.

(2 x 2) + (5 x 3) = ?

• 7

• 19

• 12

Row, row, row, ...

• your boat, gently down the stream!

• array, column, column, column!

• array, column, column, column! The end!

• Huh?