Lesson study, especially when conducted with support from targeted resources, is often identified as a potentially effective means to support teacher learning. In this study, 80 school-based teams of ...educators, representing 80 classrooms of third- or fourth-grade students in the US, were randomly assigned to one of four conditions: lesson study supported by fractions resources, lesson study only, fractions resources only, or a comparison group. Fractions instruction was improved in the two conditions that received the fractions resources. Average student performance on a fractions test did not increase relative to the comparison group in any of the three intervention conditions. However, moderation analyses suggest that lesson study, both with and without fractions resources, may have improved student performance in one state, which represented half of the sample.
Mice in a cage Riddell, Claire
Teaching children mathematics,
02/2017, Letnik:
23, Številka:
6
Journal Article
Recenzirano
Students will engage in a both-addends-unknown problem to explore the different ways that seven mice can be arranged in two cages. Students will work with combinations of seven and have the ...opportunity to justify and reason about the total number of combinations possible. Students will also make generalizations about the relationship between the number of mice and the total number of combinations possible. Each month, elementary school teachers are presented with a problem along with suggested instructional notes; asked to use the problem in their own classrooms; and encouraged to report solutions, strategies, reflections, and misconceptions to the journal audience.
How many tickets? Riddell, Claire
Teaching children mathematics,
10/2016, Letnik:
23, Številka:
3
Journal Article
Recenzirano
This article introduces a task designed around SMP 7: Look for and make use of structure, and it encourages students to explore structure through multiple representations. Each month, elementary ...school teachers are presented with a problem along with suggested instructional notes and asked to use the problem in their own classrooms and report solutions, strategies, reflections, and misconceptions to the journal audience.
Exploring how many pattern blocks will completely fill the Rocket Ship puzzle, students are challenged to use the most and fewest number of blocks possible. They have the opportunity to explore the ...composition and decomposition of shapes and generalize ideas about the relationship between the size of the pieces and the number of pieces. Each month, elementary school teachers are presented with a problem along with suggested instructional notes; asked to use the problem in their own classrooms; and encouraged to report solutions, strategies, reflections, and misconceptions to the journal audience.
Height, diameter, and survival data were obtained from 20 range-wide black spruce (Picea mariana (Mill.) BSP) provenance trials established from 1973 to 1977. Population response functions based on ...February minimum temperatures were developed for 23 Ontario and Great Lakes states provenances to predict climate values maximizing height growth for individual seed sources. Site transfer functions based on February maximum temperatures and May maximum temperatures were developed for five test sites to predict climate values maximizing height growth for test locations. Contour lines representing optimal performance were fitted to current (1961-1990) and future (2041-2070) climate grids. For black spruce seed sources from the east of Lake Superior and Lake Huron, optimal height growth was achieved between 45° and 47°N; for the western sources optimal performance moved north between 46° and 48°N. In eastern Ontario, height growth of northern sources may increase with transfer to warmer environments and with future temperature increases. Central sources are currently growing at or close to optimum and will be negatively affected by increased future temperatures. Southern sources may currently benefit from transfer to cooler environments, and the effects of global warming may cause significant height growth loss and the potential extirpation of local populations.
Variations in Both-Addends-Unknown Problems Champagne, Zachary M; Schoen, Robert; Riddell, Claire M
Teaching children mathematics,
09/2014, Letnik:
21, Številka:
2
Journal Article
Recenzirano
Early elementary school students are expected to solve twelve distinct types of word problems. A mathematics researcher and two teachers pose a structure for thinking about one category that has not ...yet been empirically studied.
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