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144 (one hundred [and] forty-four) is the natural number following 143 and preceding 145. It is coincidentally both the square of twelve (a dozen dozens , or one gross .) and the twelfth Fibonacci number , and the only nontrivial number in the sequence that is square.
The stepped reckoner or Leibniz calculator was a mechanical calculator invented by the German mathematician Gottfried Wilhelm Leibniz (started in 1673, when he presented a wooden model to the Royal Society of London [2] and completed in 1694). [1]
A partially disassembled Curta calculator, showing the digit slides and the stepped drum behind them Curta Type I calculator, top view Curta Type I calculator, bottom view. The Curta is a hand-held mechanical calculator designed by Curt Herzstark. [1] It is known for its extremely compact design: a small cylinder that fits in the palm of the hand.
The six-colour Dino Cube in the middle of a move, showing how the puzzle can be scrambled. Note the black pieces inside of the puzzle: these are "hidden" corner pieces which form the core of the puzzle. The Dino Cube is a twisty puzzle in the shape of a cube. It consists of 12 movable pieces, all of which are located on the edges of the cube ...
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Demonstration, with Cuisenaire rods, of the first four highly composite numbers: 1, 2, 4, 6. A highly composite number is a positive integer that has more divisors than all smaller positive integers. If d(n) denotes the number of divisors of a positive integer n, then a positive integer N is highly composite if d(N) > d(n) for all n < N.
[42] [43] It was drawn up in detail, but never built, and the drawings have never been found. Ludgate's engine would be much smaller (about 8 cubic feet (230 L), which corresponds to cube of side length 2 feet (61 cm)) than Babbage's, and hypothetically would be capable of multiplying two 20-decimal-digit numbers in about six seconds. [44]
In the case of a negative 11, multiplier, or both apply the sign to the final product as per normal multiplication of the two numbers. A step-by-step example of 759 × 11: The ones digit of the multiplier, 9, is copied to the temporary result. result: 9; Add 5 + 9 = 14 so 4 is placed on the left side of the result and carry the 1. result: 49