KhanAcademyExercises

An exercise to test the understanding of the working of various intrauterine devices and pills

The exercise explores the mechanisms of action of various IUDs and contraceptive pills

Practice finding the area of part of a circle.

Practice interesting area and circumference problems.

Check your understanding of periodic trends in this set of free practice questions designed for AP Chemistry students.

Factor and expand expressions like -3x-9 by applying the distributive property.  Expressions include variables and negative numbers.

Practice combining like terms for expressions that have rational coefficients. This requires adding and subtracting fractions.

Principles of natural methods, barrier methods, and surgical methods of contraceptives

Let's practice some problems to test our understanding of electromagnetic induction.

Divide 3-digit and 4-digit numbers by a 2-digit number.  Some quotients include remainders.

Practice solving fraction addition and subtraction word problems. The fractions in these problems have unlike denominators.

Practice constructing, interpreting, and solving linear inequalities that model real-world situations.

Practice finding the difference between times given on two analog clocks. Time differences cross over the hour.

Rationalising the denominator (advanced)

Learn how to find which term are we talking about given its speciality or property.

Using Faraday's law, let's analyze some more interesting situations and determine if an EMF will be induced or not.

A galvanometer is a sensitive instrument with a small range of currents it can measure. Let's solve some problems to better understand how to convert a galvanometer into an ammeter or voltmeter with a bigger range of measurements.

Practice solving basic proportions.

Practice telling whether or not the relationship between two quantities is proportional by looking at a table of the relationship.

Practice telling whether or not the relationship between two quantities is proportional by reasoning about equivalent ratios.