scholarly journals The problem with percentages

2018 ◽  
Vol 373 (1740) ◽  
pp. 20160519 ◽  
Author(s):  
Jennifer A. Jacobs Danan ◽  
Rochel Gelman
Keyword(s):  
Elementary School ◽  
Elementary School Students ◽  
Research University ◽  
Rational Numbers ◽  
Core Knowledge ◽  
Natural Numbers ◽  
Major Research ◽  
School Students ◽  
Simple Arithmetic ◽  
Numerical Abilities

A great many students at a major research university make basic conceptual mistakes in responding to simple questions about two successive percentage changes. The mistakes they make follow a pattern already familiar from research on the difficulties that elementary school students have in coming to terms with fractions and decimals. The intuitive core knowledge of arithmetic with the natural numbers makes learning to count and do simple arithmetic relatively easy. Those same principles become obstacles to understanding how to operate with rational numbers. This article is part of a discussion meeting issue ‘The origins of numerical abilities’.

From the Classroom: Student-constructed problems extend proportional reasoning

2010 ◽  
Vol 17 (1) ◽  
pp. 16-19
Author(s):  
Millard W. Lamm ◽  
David K. Pugalee
Keyword(s):  
Elementary School ◽  
Elementary School Students ◽  
Mathematics Curriculum ◽  
Mathematical Thinking ◽  
Proportional Reasoning ◽  
Rational Numbers ◽  
Learning Progression ◽  
School Students ◽  
Elementary School Math ◽  
And Mathematics

Proportional reasoning is perhaps one of the most important types of mathematical thinking for elementary school students to develop. It includes aspects of rational numbers, spans the entire mathematics curriculum, and is a significant foundation for mathematical proficiency. Understanding students' use of proportional reasoning is a basis on which to develop benchmarks or guideposts that can provide a descriptive picture of the learning progression between elementary school math and mathematics encountered in later grades.

PROFIL BERPIKIR REFLEKTIF SISWA SD DALAM PEMECAHAN MASALAH PECAHAN BERDASARKAN KEMAMPUAN MATEMATIKA

EDUKASI ◽  
2016 ◽  
Vol 14 (2) ◽  
Author(s):  
Hery Suharna ◽  
Agung Lukito Nusantara ◽  
I Ketut Budayasa
Keyword(s):  
Elementary School ◽  
Problem Solving ◽  
Elementary School Students ◽  
Reflective Thinking ◽  
Research Subjects ◽  
Math Skills ◽  
School Students ◽  
Calculation Skills ◽  
High Ability Students ◽  
Selection Of

The research reveals a profile of reflective thinking of elementary school students in problem solving fractions based on his mathematical abilities. The instruments used in data collection is Test Problem Solving (TPM), interview. Selection of research subjects in a way given test is based on the ability of mathematics, namely mathematical skills of high, medium and low and further categorized and taken at least 2 people to serve as subjects. The research objective is: describe the profile of reflective thinking that math skills of elementary school students High, medium, and low. Based on the results of the study found reflective thinking profile and high ability students were as follows: (a) the step to understand the problems students have information/knowledge or data that is used to respond, comes from inside (internal) and can explain what has been done; (B) the planned step problem solving students have information/knowledge or data that is used to respond, comes from inside (internal) and can explain what has been done; (C) on measures to implement the plan in terms of information/knowledge or data used by students to respond, comes from inside (internal), could explain what has been done, realized the error and fix it, and communicate ideas with a symbol or image, and (d) the checking step back, namely information/knowledge or data that is used by students to respond, comes from inside (internal) and can explain what has been done. Profile of reflective thinking ability students lowly mathematics, namely: (a) at the stage of understanding the problem, students can determine known and asked in the problem, but the students' difficulties to explain the identification of the facts that have been done, the students explained the understanding vocabulary, and feel of existing data the matter is enough; (B) at the stage of implementing the plan, the students explained, organize and represent data on the issue, describes how to select the operation in solving a problem though students are not sure, and students' difficulty in explaining what he had done; (C) at the stage of implementing the plan, the student has information on calculation skills although the answer is not correct. Students difficulty in explaining about the skills calculations have been done, trying to communicate their ideas in the form of symbols or images, even if students rather difficult to describe, and realized there was an error when using a calculation skills and improve it; (D) at the stage of check, students' difficulties in explaining whether obtained estimates it approached, it makes senseKeywords: reflective thinking, problem solving, fractions, and math skills.

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