4.1+Number+and+numerical+operations

Grade Level:Grade 2 Website Site Title: Elementary Websites URL: http://edweb.tusd.k12.az.us/ekowalcz/math/elementary_web_sites.htm Description:Websites on number sense and operations Contributor: Tatiana Rebelo

Grade Level: Grade 2 Web Site Title: Jan Brett URL: http://www.janbrett.com/piggybacks/rounding.htm Description: Rounding numbers Contributor: Tatiana Rebelo

Grade Level: Grade 1 Web Site Title: Internet 4 classrooms URL: http://www.internet4classrooms.com/skills_1st.htm Description: Interactive sites for 1st Graders Contributor: Tatiana Rebelo

Grade Level: 3 & 4 Web Site Title: linkslearning URL: http://www.linkslearning.org/Kids/1_Math/2_Illustrated_Lessons/3_Place_Value/index.html Description: a clear review of a **place value** lesson to return to whenever the student gets stuck or confused Contributor: Patricia Carella

Grade Level: 1-4 Web Site Title: Circle 21 URL: http://nlvm.usu.edu/en/nav/frames_asid_188_g_2_t_1.html?open=instructions Description: //Challenging!// The goal of this puzzle is to put t**hree numbers inside of each circle so that they add up to 21.** Solve the puzzle by dragging the black numbers to the blank spaces. You cannot move the blue numbers. When the three numbers inside any circle add up to 21, the circle changes color. Contributor: bweitzman

Grade Level: 3-5 Web Site Title: Krypto URL: http://illuminations.nctm.org/ActivityDetail.aspx?ID=173 Description:Game which uses 5 cards and arithmetic operations to create a target number. Contributor: llockard

Grade Level: Web Site Title: URL: http://www.slideshare.net/simonesu/amazing-math-trick/ Description: Contributor: