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Everything is organized by grade and by Common Core standard. Tell us who you are, and weโ€™ll show you the best way in.

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๐Ÿ“˜ Lessons, courses & reading

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๐Ÿง  Learning tools

๐Ÿงฎ Math calculators

๐ŸงฎScientific calculator onlineA free scientific calculator with exact fractions and roots, step-by-step explanations, equation solving, graphs and statistics. No ads, no sign-up.๐Ÿ’ฏPercentage calculatorWork out a percentage of a number, what percent one number is of another, the percentage increase or decrease, and prices before and after a discount.โž—Fraction calculator with stepsAdd, subtract, multiply and divide fractions and mixed numbers. Answers are simplified, shown as a mixed number and a decimal, with every step explained.๐Ÿ“Quadratic equation solverSolve axยฒ + bx + c = 0 with the quadratic formula: the discriminant, real or complex roots and the vertex of the parabola, shown step by step.๐ŸŽ“Grade average calculatorAverage your grades out of 100, as a simple average or weighted by credits or study units. Add as many subjects as you need and see the result at once.โš–๏ธBMI calculator for adultsWork out your body mass index from weight and height, in kilograms and centimetres or pounds, feet and inches, with the standard adult ranges explained.๐Ÿ’ตTip calculator and bill splitterWork out the tip, the total and each person's share of the bill. Choose a tip percentage, split between friends and round shares up if you like.๐ŸงพSales tax and VAT calculatorAdd sales tax or VAT to a net price, or take it out of a price that includes it. Any rate, with presets for US sales tax, Canada, the UK, Europe, Australia and Israel.๐Ÿ’ฑCurrency converterConvert between US dollars, euros, pounds, Canadian dollars and dozens more currencies at the daily reference rate. Keeps working with the last rates when offline.

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