# Multiplying a Double by a Single Digit Number- Open Middle Problem

Directions: Using the numbers 1-9, each only once, fill in the boxes to make the following product true. How many possibilities are there?

# Making 10’s- Open Middle Problem

Directions: Using the integers 0 to 9, each only once, fill in the following blanks to make the equations true.

___ + ___ = 10 + ___

___ + ___ = 10 + ___

___ + ___ = 10+ ___

# Open Middle Problem- Open Number Sentence 2

Directions: Using the Integers 0 to 9, each only once, how many different ways can you fill in the blanks to make the statement true?

# Open Middle Problem- Open Number Sentence

Directions: Using the Integers 0 to 9, each only once, how many different ways can you fill in the blanks to make the statement true?

# Complex Number Operations- Open Middle Problem

Directions: Using the digits 1 to 9, fill in the boxes to make the equality true.  You can use each digit only once. How does changing the signs between the Complex Numbers change the problem?

How does changing the signs between the Real and Imaginary parts of the Complex Number change the problem?