math and the minds eye activities 4

Unit IV I Math and the Mind's Eye Activities Modeling Rationals ath and the Mind's Eye materials Egg Carton Fractions Egg carron diagrams are used as visual models tion equivalence to inrroduce fractions and frac- Fractions on A Line Line segments are divided into equal parts as a means of introducing the division model for fractions are intended for use in grades 4-9 They are written so teachers can adapt them to fit student backgrounds and grade levels A single activity can be extended over several days or used in part Fraction Bars The Fraction Bar"-'> model for fractions is introduced and used to discuss fraction equaliry and inequality Addition and Subtraction with Fraction Bars Franion bars are used to illustrate processes for adding and subtracting fraccions Multiplication and Division with Fraction Bars Fraction bJ.rs are used ro illustrate processes for multiplying and dividing fractions Introduction to Decimals A catalog of Math and the Mind's Eye materials and teaching supplies is available from The Math Learning Center, PO Box 3226, Salem, OR 97302, 800 575-8130 or (503) 370-8130 Fax: (503) 370-7961 Learn more about The Math Learning Center at: www.mlc.pdx.edu \'\lith the aid of base 10 mimber pieces, the concept of a decimal is imroduccd and decimal norarion is discmsed Decimal Addition and Subtraction Base I number pieces are used ing decimals to develop processes fnr adding and subtract- Decimal Length and Area Thl' dimensions and areas of rectangles are found and the distinction between linear measure and area measure is discussed Decimal Multiplication and Division Base 10 number piece rectangles arc used m tlnd the produn and quorienr of decimals Fraction Operations via Area: Addition and Subtraction Fractions are reprl'senred by areas of rectangular regions, and fraction sums and ､ ｩ ｈ Ｍ ｃ ｮ Ｚ ｮ ｣ ｣ Ｎ ｾ found by finding rhe sums and differences of areas Fraction Operations via Area: Multiplication Two Fractions are multiplied by viewing them as rhe dimensions of a recrangle and their product as rhe rectangle's area Fraction Operations via Area: Division The quotiem of two fracdons is f(mnd by constructing a rectangle for which the area and one dimension are given Math and the Mind's Eye Copyrighr ([I ! ')HR ｔ ｨ ｾ J'\lnh ｌ ｾ ｡ ｲ ｮ ｩ ｮ ｧ C:ntu The 1\hrh ｌ ｾ Ｚ ｮ ｮ ｩ ｮ ｧ Ccntn want.> permi,siun w classroom teachers w rqlfoJuco: the stu