Beräkningar av subtraktionsuppgifter visar sig vara en utmaning för svenska elever i årskurs 3. Problematiken ligger i valet av beräkningsmetoder, där dessa inte är lika effektiva och framgångsrika som vid beräkningar av addition. Denna studie är inspirerad av en fenomenografisk ansats, som syftar till att redogöra för vilka uppfattningar elever i ...
The purpose of this study is to examine teachers, in the elementary grades 2 and 3, view on pupils ' understanding of regrouping in subtraction algorithms and the use of concrete materials to facilitate pupils' understanding of regrouping in subtraction algorithms. The study emanates from teachers who teach, or have taught, in regrouping in subtrac...
Learning to calculate with natural numbers by structuring seems promising but how this can be taught in a sustainable manner remains an open question. An eight-month-long intervention based on the idea of using a structural approach to addition and subtraction, and particularly bridging through ten, was implemented in four Swedish first-grade class...
Practical reasons can be aggregated to decide what one ought to do. This paper explores an operation that undoes aggregation: subtraction. I consider several distinctions concerning subtraction: subtracting content and subtracting strength; and subtracting one reason from one other reason or from a set of reasons. I put forward a precise understand...
Published in Cognitive science
We have evolved to become who we are, at least in part, due to our general drive to create new things and ideas. When seeking to improve our creations, ideas, or situations, we systematically overlook opportunities to perform subtractive changes. For example, when tasked with giving feedback on an academic paper, reviewers will tend to suggest addi...
Published in Surgical Neurology International
Background: Our recent report showed that 1.5-T pulsed arterial spin labeling (ASL) magnetic resonance (MR) perfusion imaging (1.5-T Pulsed ASL [PASL]), which is widely available in the field of neuroemergency, is useful for detecting ictal hyperperfusion. However, the visualization of intravascular ASL signals, namely, arterial transit artifact (A...
Third grade math students demonstrated their mathematical understanding and critical thinking skills by engaging in conversations about patterns and by actively exploring, analyzing, and making connections within patterns. High-leverage math routines and pattern exploration engaged students in mathematical thinking and fostered their ability to rec...
The resolution of arithmetic problems represents an extremely important topic that encompasses various aspects such as the academic training of students, their own didactics for the teaching -learning process, as well as in training and teaching practice. In such a way that, one of the tools of greatest prominence within the school classroom such a...
Light, shadow and shade are at the foundation of our cartesian understanding of 3D space. Where light falls on matter the difference in shading allows us to see this space. However, light also breaks this understanding creating the potential for a phenomenological understanding instead. Which is seen with an extradimensionality in certain situation...
Published in Japanese journal of radiology
The purpose of this study was to investigate the usefulness of temporal subtraction CT (TSCT) of temporal bone CT for the detection of postoperative recurrent/residual cholesteatoma of the middle ear. Thirty-two consecutive patients with surgically proven postoperative recurrent/residual cholesteatoma and 14 consecutive patients without recurrent/r...
