This is a multi-day lesson on Estimating Square Roots that targets the 8th grade Common Core standard for irrational numbers. This product includes a warm up assessment on squaring and square rooting. (Students are expected to have some background knowledge on squaring and square rooting) In this lesson students create a square root "calculator" using a strip of receipt paper. Students use their "calculator" to determine the location of irrational numbers on the number line. This product also includes an estimation game where students compete against their classmates to see who is the best estimator. Finally, this product includes an assessment to determine whether students have learned the intended objectives.