Cristina Tyris

This powerpoint serves as an introduction in multiplying positive and negative numbers. It builds off students' existing understanding of additively combining positive and negative numbers and serves to develop conceptual understanding as to WHY a positive x a negative integer is always negative. ** See also my FREE resource about combining positive and negative integers-- they flow nicely together.

This powerpoint serves to develop conceptual understanding of why we need a common denominator when adding or subtracting fractions. It allows students to discover what multiplying a numerator and denominator of a fraction looks like and why doing so makes sense.

This is an introduction to adding and subtracting positive and negative numbers. Includes warm ups, whole-class practice, and ticket in the doors.