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OpenStem
@openstem · Joined Jul 2026
7420 public items8 groups
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01Mathematics · L4 · Calculus I — Limits & Derivatives
02Mathematics · L4 · Calculus — Integration Techniques
Mathematics · L4 · Single-Variable Calculus
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Mathematics · L4 · Single-Variable CalculusCollection1 items
01Mathematics · L4 · Linear Algebra — Vectors & Matrices
Mathematics · L4 · Linear Algebra Foundations
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Mathematics · L4 · Linear Algebra FoundationsCollection1 items
01Mathematics · L4 · Number Theory & Combinatorics
Mathematics · L4 · Discrete Math & Number Theory
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Mathematics · L4 · Discrete Math & Number TheoryCollection4 items
01Mathematics · L4 · Probability — Fundamentals
02Mathematics · L4 · Bayesian reasoning and Bayes' theorem
03Mathematics · L4 · Probability tree: conditional outcomes
+1 moreMathematics · L4 · Probability Primer
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Mathematics · L4 · Probability PrimerCollection1 items
01Mathematics · L4 · Descriptive Statistics — Summarising Data
Mathematics · L4 · Descriptive Statistics
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Mathematics · L4 · Descriptive StatisticsCollection1 items
01Mathematics · L4 · Probability Foundations
Mathematics · L4 · Probability Distributions
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Mathematics · L4 · Probability DistributionsCollection2 items
01Mathematics · L4 · Regression & Predictive Modelling
02Mathematics · L4 · Bayesian Statistics — Thinking in Probability
Mathematics · L4 · Regression & Bayesian Methods
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Mathematics · L4 · Regression & Bayesian MethodsCollection4 items
01Mathematics · L4 · Statistical Inference — Estimation & Tests
02Mathematics · L4 · p-values and statistical significance: what they really mean
03Mathematics · L4 · Hypothesis testing decision flowchart
+1 moreMathematics · L4 · Hypothesis Testing
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Mathematics · L4 · Hypothesis TestingCollection4 items
01Mathematics · L4 · Differential Equations — First-Order ODEs
02Mathematics · L4 · Solving first-order differential equations
03Mathematics · L4 · Choosing an ODE solution method
+1 moreMathematics · L4 · Differential Equations
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Mathematics · L4 · Differential EquationsCollection8 items
01Mathematics · L5 · Real Analysis Foundations
02Mathematics · L5 · Group & Ring Theory
03Mathematics · L5 · Groups: Axioms and First Examples
+5 moreMathematics · L5 · Analysis, Algebra & Topology
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Mathematics · L5 · Analysis, Algebra & TopologyCollection11 items
01Mathematics · L5 · Measure-Theoretic Probability
02Mathematics · L5 · Asymptotics & Limit Theorems
03Mathematics · L5 · Measure-Theoretic Probability: Foundations
+8 moreMathematics · L5 · Statistics
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Mathematics · L5 · StatisticsFlashcards5 cards
How many fingers do you have on one hand?1 / 5
You have 5 fingers on one hand. Count them: 1, 2, 3, 4, 5!
Mathematics · L1 · Counting and Numbers
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Mathematics · L1 · Counting and NumbersFlashcards5 cards
What does the 2 mean in the number 24?1 / 5
The 2 is in the tens place. It means 2 tens, which is 20. The 4 is 4 ones.
Mathematics · L1 · Place Value: Tens and Ones
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Mathematics · L1 · Place Value: Tens and OnesFlashcards5 cards
You have 3 red apples and 2 green apples. How many apples are there?1 / 5
There are 5 apples. Count them all together: 3 + 2 = 5.
Mathematics · L1 · Counting and Sorting
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Mathematics · L1 · Counting and SortingFlashcards5 cards
What is a tally mark?1 / 5
A tally mark is a line you draw each time you count one thing. Four lines then a slash through makes 5.
Mathematics · L1 · Tally Marks
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Mathematics · L1 · Tally MarksFlashcards7 cards
Maya has 4 apples. She picks 3 more apples from a tree. How many apples does she have now?1 / 7
She has 7 apples. 4 + 3 = 7. Put the apples together and count them all.
Mathematics · L1 · Addition & Subtraction Stories
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Mathematics · L1 · Addition & Subtraction StoriesFlashcards8 cards
What is skip counting?1 / 8
Skip counting means counting forward by jumping the same amount each time, instead of counting by ones. Counting by 2s goes 2, 4, 6, 8 — each jump adds 2.
Mathematics · L1 · Skip Counting & Patterns
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Mathematics · L1 · Skip Counting & PatternsFlashcards8 cards
Look at two pencils: one is 10 cm long, the other is 15 cm long. Which one is longer?1 / 8
The 15 cm pencil is longer. The bigger the number in centimetres, the longer the object is.
Mathematics · L1 · Measuring Length & Weight
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Mathematics · L1 · Measuring Length & WeightFlashcards7 cards
What do we call it when the long hand points to 12 and the short hand points straight at a number?1 / 7
We call it an "o'clock" time. For example, when the short hand points to 4 and the long hand points to 12, it is 4 o'clock.
Mathematics · L1 · Telling Time & Calendars
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Mathematics · L1 · Telling Time & CalendarsFlashcards8 cards
What shape is a dice (die), and how many faces does it have?1 / 8
A dice is a cube. It has 6 flat square faces — one for each number from 1 to 6.
Mathematics · L1 · 3D Shapes & Symmetry
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Mathematics · L1 · 3D Shapes & SymmetryFlashcards7 cards
You sort a box of toy blocks by one rule: colour. What do you do with all the red blocks?1 / 7
Put all the red blocks together in one group. Every block in that group must be red — that is the one rule.
Mathematics · L1 · Sorting with Venn Diagrams
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Mathematics · L1 · Sorting with Venn DiagramsFlashcards7 cards
The sun will rise tomorrow morning. Is this certain, likely, unlikely, or impossible?1 / 7
It is certain. The sun has risen every single morning, so we know for sure it will happen again.
Mathematics · L1 · Likely, Unlikely, Certain
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Mathematics · L1 · Likely, Unlikely, CertainFlashcards8 cards
You have 1 quarter, 1 dime, and 1 nickel. How much money do you have in total?1 / 8
You have 40¢. A quarter is 25¢, a dime is 10¢, and a nickel is 5¢. 25 + 10 + 5 = 40¢.
Mathematics · L1 · Money & Making Change
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Mathematics · L1 · Money & Making ChangeFlashcards8 cards
What does 3 × 4 mean?1 / 8
It means 3 groups of 4. You can find the total by adding: 4 + 4 + 4 = 12.
Mathematics · L1 · Simple Multiplication
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Mathematics · L1 · Simple MultiplicationFlashcards8 cards
You have 12 cookies and share them equally among 4 friends. How many cookies does each friend get?1 / 8
3 cookies each. Give one cookie at a time to each friend, going around the group, until all 12 are gone: 4 friends × 3 cookies = 12 cookies.
Mathematics · L1 · Simple Division
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Mathematics · L1 · Simple DivisionFlashcards8 cards
What does the > symbol mean?1 / 8
"Greater than." The number on the wide open side is the bigger one. 8 > 3 means 8 is greater than 3.
Mathematics · L1 · Comparing & Ordering Numbers
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Mathematics · L1 · Comparing & Ordering NumbersFlashcards7 cards
A toy sits on a shelf above your bed. Is the toy higher up or lower down than your bed?1 / 7
Higher up. 'Above' means something is higher than another thing. From the bed's point of view, the shelf is above it — and the bed is below the shelf.
Mathematics · L1 · Position & Direction Words
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Mathematics · L1 · Position & Direction WordsFlashcards8 cards
What is a number bond?1 / 8
A number bond is a pair of numbers that add together to make a target number. For example, 3 and 7 are a number bond to 10, because 3 + 7 = 10.
Mathematics · L1 · Number Bonds to 10 and 20
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Mathematics · L1 · Number Bonds to 10 and 20Flashcards8 cards
What is a bar graph used for?1 / 8
A bar graph uses bars of different heights to show how many of something there are, so you can compare groups just by looking.
Mathematics · L1 · Making & Reading Bar Graphs
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Mathematics · L1 · Making & Reading Bar GraphsFlashcards10 cards
What does it mean for a number to be EVEN?1 / 10
A number is even if you can split it into two equal groups, or pair everything up with nothing left over.
Mathematics · L1 · Odd & Even Numbers
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Mathematics · L1 · Odd & Even Numbers