Grades 1 & up. Build number fact fluency in just a minute! The familiar math fact family triangle is reinterpreted in an engaging electronic format. Encourages practice of operations (add/subtract or multiply/divide) and early algebraic skills related to equations and the commutative property. Offers a 60-second timed mode and a low-pressure untimed mode, plus 3 levels of difficulty. Reinforces arts of the equation through color-coded screen frames. Provides positive, corrective feedback -- both visual and auditory. Durable, triangle-shaped unit with volume control measures 5 1/2"H. For individual practice, or for 2 - 5 students answering together. Requires 3AAA batteries, not included.