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Students will first estimate the weight of items in grams / kilograms and then weight and record the actual weight of each item.
In fourth grade, students need to be familiar with the terms gram and kilogram. Grams and kilograms are metric units used to measure the mass of an object. One kilogram is equal to 1000 grams. One gram weighs about as much as a large paperclip and one kilogram is equal to about 2.2 pounds.
4. Communicate mathematically.
Invitation to Learn
Have students make a list of items they think weigh one gram. Discuss the lists as a class. Does everyone agree? Why or why not? Have students make a list of items they think weigh one kilogram. Discuss as a class.
Lo, J.J. (1991). Learning To Talk Mathematics. ERIC # ED334073. Retrieved December 14, 2005, from http://www.eric.ed.gov
This study focused on mathematical discourse, with the main goal being both the characterization of the potential learning opportunities and the inference of students construction of mathematical meanings. Results indicate that classroom mathematical discourse is a rich environment for both student growth and mathematical learning, which was confirmed by more elaborate schema for mathematical reasoning and problem solving.
Ball, D. (1991). Whats all this talk about discourse? Professional Standards for Teaching Mathematics. National Council of Teachers of Mathematics, 1991.
Deborah Ball defines discourse as described by the NCTM Standards. A discussion taken from her classroom, along with entries from her teaching journal, illustrate how thoughtful discourse can be used to help students learn to discuss and understand mathematics concepts.