What are number series? These are quantitative (number based) patterns represented by objects in columns. The goal is to determine the next logical amount in the series by identifying the patterns. This activity encourages students to think outside of the box and is often used in Gifted & Talented admissions tests such as CoGAT, T&E, NNAT. It can be used for your differentiated instruction or math centers. Encourage students to explain their rationale as they solve these patterns. What's