# Khan Algebra Course

Kakooma - Greg Tang Math About Kakooma starts with a deceptively simple idea: in a group of numbers, find the number that is the sum of two others. Sounds easy, right? Playing KAKOOMA Kakooma is great for people of all ages. Start with the mini-puzzle at the top. Difficulty levels The size of the puzzle and the size of the puzzle’s numbers determine its difficulty. Here is an example of a more difficult puzzle with 9 numbers and sums up to 25. Kakooma Negatives Kakooma can also be played with negative numbers. Starting with the top left mini-puzzle, the answer is 2 since -4 + 6 = 2. Kakooma Fractions Ready for a new challenge? Starting with the mini-puzzle at the top, the answer is 5/12 since 3/12 + 1/6 = 5/12. Kakooma Times With Kakooma Times, players switch from finding sums to finding products. Starting with the top, left mini-puzzle, the answer is 21 since 7 x 3 = 21. In this last puzzle, note that the operation switches from multiplication back to addition (since the numbers are double-digits).

101 uses of a quadratic equation March 2004 It isn't often that a mathematical equation makes the national press, far less popular radio, or most astonishingly of all, is the subject of a debate in the UK parliament. However, in 2003 the good old quadratic equation, which we all learned about in school, was all of those things. Where we begin It all started at a meeting of the National Union of Teachers. Where would it all end? Maybe so, but it's not really the quadratic equation's fault. The Babylonians Babylonian cuneiform tablets recording the 9 times tables It all started around 3000 BC with the Babylonians. Let's suppose that you are a Babylonian farmer. is the length of the side of the field, is the amount of crop you can grow on a square field of sidelength 1, and is the amount of crop that you can grow, then This is our first quadratic equation, naked and blinking in the sunlight. crops to pay for the taxes on your farm." Now, not all fields are square. For appropriate values of and to give formula": and hypotenuse then .