Khan Academy Exercises and Videos

Enlarging Shapes

2026-09-03T06:32:15.813417

Enlarging Shapes

Using Infographics

2026-09-03T06:32:15.813417

Infographics

Sharing in a Ratio

2026-09-03T06:32:15.813417

Sharing in a Ratio

Sharing in Ratio

2026-09-03T06:28:30.389265

Sharing in a Ratio

Using Statistics

2026-09-03T06:28:30.389265

Using Statistics

Miles and Kilometres | Units of Length or Distance

2026-09-03T06:28:30.389265

Miles and Kilometres | Units of Length or Distance

Ocean systems, resources, and human activity

2026-09-02T14:40:46.230053

Humans depend on healthy ocean systems for food, oxygen, climate regulation, coastal protection, and global trade. However, some human activities may harm ocean systems. For example, shrimp farming can destroy mangrove forests, disrupting marine food webs and releasing stored carbon. Plastic pollution and ocean warming create additional threats, while mangrove restoration, sustainable aquaculture, and responsible seafood choices can help protect ocean ecosystems.

Watersheds and human activity

2026-09-01T20:00:48.903089

Human activities can affect the health of an entire watershed. Some harmful human activities (such as runoff from agriculture, urbanization, deforestation, and water diversions) can cause pollution, erosion, and low-oxygen zones. However, other beneficial human activities (such as sustainable farming, green infrastructure, reforestation, and water conservation) can protect water quality and ecosystems. The Chesapeake Bay shows how actions upstream can have far-reaching effects downstream.

Intro to Levers: Simple Machines (PK)

2026-08-28T05:49:03.108515

Intro to Levers: Simple Machines

Using Spirit Level: 1 (Checking balance)

2026-08-28T04:16:03.034812

Using Spirit Level: 1

Verifying accuracy and choosing the best option

2026-08-26T12:50:54.241367

Data category: verifying data accuracy by cross-checking sources. Tasks category: decision-support tasks (comparing two suppliers, two job quotes, or two delivery routes). Strategies and tools category: spreadsheet used to lay out and compare the options. Learners verify the figures, then select the best option.

Recalling measurement units and conversion facts

2026-08-26T12:50:54.241367

Measurement and spatial category: length units (m, cm, mm), mass units (kg, g), and volume units (L, mL) used in trades. Strategies and tools category: naming the calculator as the tool used to apply these facts. Learners list units and recall the conversion factor for each pair.

Explaining relationships between numerical values

2026-08-26T12:50:54.241367

Data category: relationships between variables (hours worked and pay; quantity ordered and cost). Representations category: tables and short text showing pairs of values. Learners describe in plain words whether one value goes up, goes down, or stays the same as the other changes.

Describing patterns and trends in workplace data

2026-08-26T12:50:54.241367

Data category: patterns and trends over time. Representations category: line graphs and bar charts (weekly food cost in a carinderia, daily call volume in a business process outsourcing or BPO center). Learners state whether the data is rising, falling, steady, or repeating, and explain what that means for the workplace.

Building a simple formula, then calculate with it

2026-08-26T12:50:54.241367

Tasks: a routine workplace problem stated in words (tiling a floor, mixing a ratio, costing by unit). Learners first identify the quantities and the relationship between them, write their own expression or equation to represent it, choose the right tool or operation, then calculate and check the result. Constructing the expression (not substituting into a given formula) is what makes this Functional 2B.

Solving a routine workplace problem end to end

2026-08-26T12:50:54.241367

Tasks category: routine-but-varied workplace problems requiring several steps. Strategies and tools category: calculator. Learners apply calculations and measurements together to complete a real task, such as quoting a plumbing repair or pricing a batch of baked goods for a sari-sari store. Real-world constraints: the task sets explicit limits — a budget ceiling, a deadline, an accuracy or measurement tolerance — and the learner must work within them and judge whether the result actually meets them. Working under real conditions like time, cost, and accuracy is the 2B 'Level of Independence' marker that separates it from 2A.

Using measuring tools and apply units on the job

2026-08-26T12:50:54.241367

Measurement and spatial category: measuring tools (tape measure, steel ruler, measuring cup, weighing scale) and appropriate units. Tasks category: routine workplace problems (measuring lumber on a construction site, portioning ingredients in a kitchen). Learners read the tool correctly and record the measurement with its unit.

Naming the parts of tables, charts, and graphs

2026-08-26T12:50:54.241367

Representations category: tables (a daily sales table from a sari-sari store), bar charts (a chart of welding rods used per day), line graphs (a clinic line graph of patients per week), and text (a short delivery note). Learners point to and name each labeled part.

Examining variables to find patterns and summarize

2026-08-26T12:50:54.241367

Data category: relationships and patterns between variables (for example, how overtime hours relate to weekly output in a factory, or how foot traffic relates to daily sales in a store). Representations category: charts and summary tables. Learners identify the pattern and write a short summary that supports a decision.

Preparing a numerical recommendation and explaining it

2026-08-26T12:50:54.241367

Tasks category: decision-support tasks. Strategies and tools category: spreadsheets and simple formulas to build the plan. Representations category: combining a table, a chart, and explanatory text into one recommendation. Learners produce the recommendation (for example, a stocking plan for a sari-sari store or a materials plan for a repair) and explain the numbers that support it.

Understand: Gravitational force

2026-09-02T20:47:29.000000

Check your understanding of gravitational force in this set of free, standards-aligned practice questions.

Sound: Using ultrasounds to measure blood flow velocity

2026-09-02T19:40:46.000000

Questions related to ultrasound and blood flow velocity

Interpret piecewise linear functions

2026-09-02T16:42:32.000000

Interpret piecewise linear graphs in real-world contexts by identifying, calculating, and comparing rates of change for specific intervals.

Understand: Cell parts and functions

2026-09-02T14:33:14.000000

Check your understanding of cell parts and functions in this set of free, standards-aligned practice questions.

Understand: Tropical cyclones

2026-09-02T14:32:52.000000

Check your understanding of tropical cyclones in this set of free, standards-aligned practice questions.

Dividing in Ratios

2026-09-02T08:20:41.000000

Divide total amount in a given ratio.

Understanding velocity and speed

2026-09-02T03:00:51.000000

Let's solve some problems to test our understanding of the meaning of velocity and speed in Physics - both average and instantaneous.

Sound: How movements influence an ultrasound

2026-09-01T20:53:15.000000

This passage will test your knowledge on sound and audition

Subject-modifier placement | Practice

2026-09-01T20:20:22.000000

Practice modifier placement to prepare for form, structure, and sense questions on the SAT.

𝘶-substitution: indefinite integrals

2026-09-01T17:07:29.000000

Find indefinite integrals that require using the method of 𝘶-substitution.

Apply: Motion

2026-09-01T15:23:45.000000

Apply your knowledge of motion in this set of free, standards-aligned practice questions.

Systems

2026-09-01T08:35:13.000000

Check your understanding of how to use systems in this set of free practice questions aligned to AP Physics I standards.

Centre of mass of multiple particles

2026-09-01T08:34:45.000000

Let's solve some problems to practice finding the centre of mass of multiple particles.

Ohm's law: vector form

2026-09-01T08:29:57.000000

Let's practice some problems to better understand the nuances of the well-known Ohm's law when cast in vector form.

Thermal conduction (basic)

2026-09-01T07:49:11.000000

Let's solve some problems where we directly apply the formula for thermal conduction and better understand the various terms in it.

Newton's second law

2026-09-01T07:06:12.000000

Practice applying Newton's second law to symbolically solve for mass, acceleration, and force magnitude.

Net force and acceleration exercise

2026-09-01T07:04:01.000000

Practice using Newton's first law to make conclusions about an object's acceleration or the forces on the object.

Kinematic equations: calculations

2026-09-01T07:03:19.000000

Practice calculating acceleration, velocity, displacement, and time from word problems using kinematic equations

Finding displacement from velocity graphs

2026-09-01T07:02:49.000000

Practice finding displacement from velocity vs. time graphs.

Average velocity and speed in one direction: word problems

2026-09-01T07:01:57.000000

Practice calculating average velocity and speed from word problems when an object moves in one direction.