The outer core of the Earth is a fluid layer about 2,300 km thick and composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle. Its outer boundary lies 2,890 km beneath Earth's surface. The transition between the inner core and outer core is located approximately 5,150 km beneath the Earth's surface. Unlike the inner core, the outer core is liquid. The inner core is also referred to as the solid core.
Perhaps the new wave of math instruction will follow trends in reading instruction, melding together a balanced approach of basic computation and exploratory, problem-solving approaches. Tags: math instruction, math intervention, balanced instruction, back to basics instruction.
Rainbow Math is a routine designed to help students practice their math facts and gain automaticity with facts. Grouped in sets of 10 flash cards at a time, students add on additional facts as each level is mastered (each level is a new color). The flash cards are put on a ring so your student can easily flip through their facts for practice (at home and at school). Students are motivated to practice and learn their facts so they can add all the colors of the rainbow to their ring.