Math
Khan Academy has excellent videos explaining math concepts:
IXL
https://www.ixl.com/math/grade-6/multiply-and-divide-decimals-by-powers-of-ten
https://www.ixl.com/math/grade-6/add-subtract-multiply-or-divide-two-decimals
ELA
https://www.ixl.com/ela/grade-6/is-the-sentence-declarative-interrogative-imperative-or-exclamatory
https://www.ixl.com/ela/grade-6/identify-plurals-singular-possessives-and-plural-possessives
Area/Perimeter Practice
www.khanacademy.org/math/geometry/hs-geo-foundations/hs-geo-area/e/area_of_triangles_1
Stem and Leaf Plots
www.khanacademy.org/math/ap-statistics/quantitative-data-ap/histograms-stem-leaf/v/reading-stem-and-leaf-plots
Scatter Plots
www.khanacademy.org/math/ap-statistics/bivariate-data-ap/scatterplots-correlation/v/constructing-scatter-plot
Box and Whisker Plots
www.khanacademy.org/math/probability/data-distributions-a1/box--whisker-plots-a1/v/constructing-a-box-and-whisker-plot
Histogram and Stem and Leaf Plots
www.khanacademy.org/math/ap-statistics/quantitative-data-ap/histograms-stem-leaf/v/histograms-intro
Mean
https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/mean-median-basics/e/calculating-the-mean
Median
https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/mean-median-basics/e/calculating-the-mean
Mode & Median
https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/mean-median-basics/e/mean_median_and_mode
IXL
https://www.ixl.com/math/grade-6/multiply-and-divide-decimals-by-powers-of-ten
https://www.ixl.com/math/grade-6/add-subtract-multiply-or-divide-two-decimals
ELA
https://www.ixl.com/ela/grade-6/is-the-sentence-declarative-interrogative-imperative-or-exclamatory
https://www.ixl.com/ela/grade-6/identify-plurals-singular-possessives-and-plural-possessives
Area/Perimeter Practice
www.khanacademy.org/math/geometry/hs-geo-foundations/hs-geo-area/e/area_of_triangles_1
Stem and Leaf Plots
www.khanacademy.org/math/ap-statistics/quantitative-data-ap/histograms-stem-leaf/v/reading-stem-and-leaf-plots
Scatter Plots
www.khanacademy.org/math/ap-statistics/bivariate-data-ap/scatterplots-correlation/v/constructing-scatter-plot
Box and Whisker Plots
www.khanacademy.org/math/probability/data-distributions-a1/box--whisker-plots-a1/v/constructing-a-box-and-whisker-plot
Histogram and Stem and Leaf Plots
www.khanacademy.org/math/ap-statistics/quantitative-data-ap/histograms-stem-leaf/v/histograms-intro
Mean
https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/mean-median-basics/e/calculating-the-mean
Median
https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/mean-median-basics/e/calculating-the-mean
Mode & Median
https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/mean-median-basics/e/mean_median_and_mode