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New exercises from Khan Academy 2020-12-02T22:44:38.000000
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Mean and standard deviation of difference of sample proportions

Lun, 2020-10-19 21:32
Practice calculating the mean and standard deviation of sampling distributions for differences in sample proportions, and use the large count condition to determine when these sampling distributions are approximately normal.

Graph quadratics in standard form

Lun, 2020-10-19 21:27
Graph quadratic functions given in the standard form ax²+bx+c. For example, graph y=5x²-20x+15.

Evaluate logarithms (advanced)

Lun, 2020-10-19 20:45
Evaluate advanced logarithmic expressions by using the fact that a^x=b is equivalent to log_a(b)=x.

Choosing the best kinematic equation

Lun, 2020-10-19 14:59
Practice choosing the best kinematic equation to solve one-dimensional motion word problems. 

Stoichiometry: Mental math practice

Lun, 2020-10-19 05:14
Practice solving stoichiometry problems without a calculator in this set of free questions designed for AP Chemistry students.

Finding the critical value t* for a desired confidence level

Dom, 2020-10-18 20:43
Practice finding the critical value t* for some given confidence level.

Homes: reading realistic fiction; Feels Like Home 3

Dom, 2020-10-18 20:28
3rd grade reading comprehension practice using realistic fiction

Finite geometric series word problems

Dom, 2020-10-18 14:50
Understanding and solving problems with the formula for a finite geometric series

Linear equations with unknown coefficients

Dom, 2020-10-18 14:42
Solve a linear equation where the coefficients are represented by letters.

Find a missing side length when given area

Lun, 2020-10-12 15:33
Practice finding a missing side length on a rectangle when given the other side length and the area.

How has citizenship changed over time: level 1

Dom, 2020-10-11 16:31
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Biological macromolecules

Dom, 2020-10-11 16:03
How much do you know about biological macromolecules?

Effect of changes in policies and economic conditions on the foreign exchange market

Dom, 2020-10-11 16:02
Practice your understanding of how exchange rates change when economic conditions change.

Pollination and fertilisation in plants

Dom, 2020-10-11 15:58
This exercise provides practice for high school level concepts of pollination and fertilisation.

Multivariable chain rule

Ven, 2020-10-09 20:44
Given two functions, find the derivative of their composition.

Sequences and domain

Mer, 2020-10-07 19:01
Give the first few terms of a sequence, practice identifying recursive definitions with different indexes that produce the sequence.

Divide quadratics by linear expressions (with remainders)

Mer, 2020-10-07 18:50
Divide quadratic expressions by linear expressions, where the linear expression isn't a factor of the quadratic expression, so the division has a remainder.

Calculating the mean: data displays

Mar, 2020-10-06 21:44
Practice computing the mean of data sets presented in a variety of formats, such as frequency tables and dot plots.

Dividing fractions

Mar, 2020-10-06 21:42
Practice dividing fractions by fractions. No negative numbers are used in this exercise.

Subtracting decimals: hundredths

Mar, 2020-10-06 21:41
Complete subtraction problems where both numbers are written to the hundredths place.