Teaching Multiplication of Large Positive Whole Numbers Using Grating Method in Junior Secondary Schools in Obio Akpor Local Government Area of Rivers State

This study investigated the teaching of multiplication of large positive whole numbers using the grating method and the effect of this method on students’ performance in junior secondary schools. The study was conducted in Obio Akpor Local Government Area of Rivers state. It was quasi- experimental. Two research questions and one hypothesis guided the study. The sample consisted of eighty (80) Junior Secondary two (JS2) students from two (2) schools. Forty JS2 students (experimental group) were taught multiplication of large positive whole numbers using the grating method and another forty (control group) were taught the same concept using the conventional long multiplication method. The instrument used for data collection was a researcher made ‘2-item-show-working’ achievement test tagged multiplication of Large Positive Whole Numbers (MLPWN). This MLPWN was used to pre-test and post test the two groups. The MLPWN was validated and a test retest was carried out using the pearson product moment correlation to obtain a reliability coefficient of 0.75.The descriptive statistics was used to analyse the research questions while the t-statistic was used to test the hypothesis at 0.05 significant level. The result showed that the students taught multiplication of large positive whole numbers with the grating method performed better than those taught with the conventional long multiplication method. The paper recommended that secondary school mathematics teachers should integrate history of mathematics during mathematics instruction and also the curriculum designers should give history of mathematics its rightful place in Nigerian mathematics curriculum

Effects of Extended Teacher Wait-Time on Senior Secondary School Students’ Academic Achievement In Mathematics in Asa High School Abia State Nigeria

The study investigated the effects of extended teacher wait-time on senior secondary school students’ academic achievement in mathematics in Asa High School in Ukwa-West Local Government Area of Abia State. The research design employed to carry out this study was case study. A simple random sampling was used to select a unit of SS1 intact class. The sample size was twenty. Three (3) research questions and two (2) hypotheses guided this study. The instrument used for data collection was a non-participant observation technique in which video recording was used to capture all the teaching sessions in phases 1 and 2. Frequency counts, phi-coefficient and percentage mean were used to answer the research questions while chi-square statistics and t-test were used to test the hypotheses at 0.05 alpha level with df =1 and 18 respectively. The result of the study showed that mathematics teachers employed an insufficient teacher wait-time of less than 3 seconds, and that there is a moderately positive relationship between students’ accuracy of responses and teacher wait-time. The result also showed that there is a significant difference between the academic achievement of students taught mathematics using insufficient and extended teacher wait-time and this difference was in favour of ETWT group. Based on the findings of the study, it was recommended that mathematics teachers under training should be trained on the effective use of extended teacher wait-time of between 3-5 seconds during micro-teaching and also inspectors should lay emphasis on the use of Extended Teacher Wait-time (ETWT) when they go for classroom instruction supervision. Keywords: Teacher wait-time, questioning behaviour, mathematics, students’ academic achievement

Floodplain Mapping and Risks Assessment of the Orashi River Using Remote Sensing and GIS in the Niger Delta Region, Nigeria

Residents along the shoreline of the Orashi River have yearly been displaced and recorded loss of lives,farmland,and infrastructures. The Government’s approach has been the provision of relief materials to the victims instead of implementing adequate control measures.This research employs Shuttle Radar Topographic Mission and Google Earth imagery in developing a 3D floodplain map using ArcGIS software. The result indicates the drainage system in the study area is dendritic with catchment of 79 subbasins and 76 pour point implying the area is floodplain .Incorporating the 3D slope which reveals that> 8 and <8 makes up 1.15% and 98.85% of the study area respectively confirms the area is a floodplain. Aspect indicate west-facing slope are dark blue, 3D hillshade indicate yellow is very low area and the high area is pink and also the buffer analysis result reveals waterbodies reflecting blue with an estimated area of 1.88 km2,yellow indicate 0.79 km2 of the shoreline, red indicate 0.81 km2 of the minor floodplain and pink contain 0.82 km2 with the length of 32.82 km. The result from google earth image in 2007 indicate absent of settlement, 2013 indicate minimal settlement and 2020 indicate major settlement in the study area when correlated with 3D Floodplain mapping before and during the flood in other to analyze and manage flooding for further purpose and the majority of the area are under seize with flood like in 2020. Therefore, Remote Sensing and GIS techniques are useful for Floodplain mapping, risk analysis for control measures for better flood management

Monitoring and Quantification of Carbon Dioxide Emissions and Impact of Sea Surface Temperature on Marine Ecosystems as Climate Change Indicators in the Niger Delta Using Geospatial Technology

The Niger Delta marine environment has experienced a series of environmental disasters since the inception of oil and gas exploration, which can be attributed to climate change. Carbon dioxide (CO2) emissions and sea surface temperature (T) ties associated with burning fossil fuels, such as gas flaring, vehicular traffic, and marine vessel movement along the sea, are increasing. Using data extracted from the NASA Giovanni satellite’s Atmospheric Infrared Sounder (AIRS) and Moderate Resolution Imaging Spectroradiometer (MODIS), this study mapped the carbon footprint and T along the coastline into the deep sea from 2003 to 2011, using ArcGIS software. The spatial distribution of CO2 and T concentrations determined by the inverse distance weighting (IDW) method reveals variations in the study area. The results show an increase in the quantity of the mean tropospheric CO2 from July 2003 to December 2011, from 374.5129 ppm to 390.7831 ppm annual CO2 emissions, which also reflects a continuous increase. The average Monthly sea surface temperature had a general increasing trend from 25.79 °C in July 2003 to 27.8 °C in December, with the Pearson correlation coefficient between CO2 and T indicating 50% strongly positive, 20% strongly negative, 20% weakly positive,and 10% weakly negative. CO2 levels, like temperature, follow a seasonal cycle, with a decrease during the wet season due to precipitation dissolving and plant uptake during the growing season, and then a rise during the dry season. Carbon capture and storage technologies must be implemented to benefit the marine ecosystem and human well-being