The Metal You Can Cut With a Knife
Learn the physical properties that separate metals from non-metals, how to test a sample yourself, and the famous exceptions that break every one of the rules.
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Free study notes for CBSE & ICSE, Classes 6–12.
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Why a Bulb Only Glows When the Path Is Complete
Learn what each part of a circuit does, why a switch works wherever you put it, how to draw proper circuit symbols, and how to test what conducts electricity.
Read articleWhy Turmeric Can Spot a Base but Never an Acid
Learn which kitchen substances are acidic or basic, how to make natural indicators from cabbage and China rose, and why an antacid settles an upset stomach.
Read articleWhy Science Keeps Changing Its Mind
Learn how scientists actually work, what the four branches of science each answer, how their ideas connect, and why changing an explanation is a strength rather than a weakness.
Read articleWhen the Average Lies and the Middle Value Tells the Truth
Learn to calculate the mean, recover a missing observation from it, find the median for odd and even data sets, and judge which measure describes your data honestly.
Read articleTurning a Messy List of Numbers Into a Picture
Learn to organise raw data with tally marks, read and draw pictographs with a sensible key, and construct bar graphs to a scale that actually fits the page.
Read articleFencing a Field Versus Carpeting It
Learn to calculate perimeter and area for squares, rectangles and irregular shapes, find a missing side, and solve path and cost problems without mixing units.
Read articleHow Many Ways Can You Fold a Shape in Half?
Learn to find every line of symmetry in a figure, complete a half-drawn shape, and count the faces, edges and vertices of cubes, cones, prisms and pyramids.
Read articleSplit Any Shape Into Triangles and Its Angles Give Themselves Away
Learn to name polygons by their sides, count their diagonals, work out any interior angle sum, and name every part of a circle from chord to sector.
Read articleWhy Every Triangle's Angles Add Up to the Same Number
Learn to classify triangles by sides and angles, use the angle-sum and exterior-angle properties, construct triangles from SSS, SAS and ASA, and name every quadrilateral.
Read articleHow to Find a Missing Angle Without Measuring It
Learn complementary and supplementary pairs, linear pairs and vertically opposite angles, the parallel-line rules, and the two ruler-and-compass constructions.
Read articleThe Difference Between a Line, a Ray and a Segment
Learn to name points, lines, rays and planes, tell simple closed curves from open ones, and measure and classify every type of angle with a protractor.
Read articleTurning a Word Problem Into an Equation You Can Solve
Learn to frame expressions from words, solve linear equations by balancing and transposition, verify your answer, and handle word problems without losing the unit.
Read articleThe Order You Must Open Brackets In
Learn to add and subtract expressions by collecting like terms, multiply and divide using the laws of indices, remove nested brackets in the right order, and substitute values.
Read articleWhy Maths Suddenly Starts Using Letters
Learn what literals actually do, how to pick out terms, factors and coefficients, and how to tell like terms from unlike ones before you start simplifying.
Read articleFractions, Decimals and Percentages Are the Same Thing
Learn decimal place value, the four operations on decimals, and how to move freely between fractions, decimals, ratios and percentages in exam questions.
Read articleWhy You Flip the Second Fraction When Dividing
Learn the types of fractions, how to order unlike fractions using the LCM, and how to add, subtract, multiply and divide them and always simplify the answer.
Read articleFind the Value of One Thing and Every Sum Gets Easier
Learn the unitary method for direct and inverse variation, the speed-distance-time relations, and how to convert between km/h and m/s without guessing.
Read articleHow to Split Anything Fairly Using a Ratio
Learn to simplify and compare ratios, divide a quantity in a given ratio, and test whether four numbers are in proportion using the extremes and means rule.
Read articleWhen Is a Collection a Set, and When Is It Just a Group?
Learn what makes a collection well-defined, how to write a set in roster and set-builder form, and how equal sets differ from equivalent ones.
Read articleHow to Tell If a Number Divides Another Without Dividing
Learn the divisibility tests, how to split a number into prime factors, and how to find HCF and LCM so word problems about tiles and bells become straightforward.
Read articleHow Numbers Below Zero Actually Work
Learn where negative numbers come from, how to place and compare integers on a number line, and how to add and subtract them without losing the sign.
Read articleThe Number Properties That Make Mental Maths Easy
Learn how the commutative, associative and distributive properties turn awkward sums into easy ones, and how to round off and estimate so you can spot a wrong answer.
Read articleWhy Indians Say Lakh and Everyone Else Says Million
Learn to read and write nine-digit numbers in both the Indian and International systems, place the commas correctly, and convert between lakhs, crores and millions.
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