Cross Number


 




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RATIO & PROPORTIONS

  RATIO & PROPORTION Ratio  A ratio is a comparison of two quantities. ● A ratio can be written as a fraction; ratios are mostly written in the simplest form. ● In the above example, the ratio of rice to water in terms of the number of cups can be written in three different ways as 1 : 2 or  1/2 or 1 to 2 . Properties of Ratio ● A ratio has no unit. It is a number. For example, the ratio of 8 km to 4 km is written  as 8 : 4 = 2 : 1 and not 2 km : 1 km. ● The two quantities of a ratio should be of the same unit. The ratio of 4 km to 400 m  is expressed as (4 × 1000) : 400 = 4000 : 400 = 10 : 1 ● Each number of the ratio is called a term. ● Order of the terms in a ratio cannot be reversed.  We can get equivalent ratios by multiplying or dividing the numerator and denominator by a common number. Proportion When two ratios are equal , we say that the ratios are in Proportion. This is denoted as a : b : : c : d and it is read as ‘a is to b as c is to d’....
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MATH PUZZLE...

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  MATHEMATICS PUZZLE   1)  There are five squares (one 3x3 and four 1x1) formed with 20 matchsticks, as shown in the illustration. Move two matchstick to get seven squares. Overlapping or breaking of matchsticks or "loose ends" are not allowed. ANSWER: Seven squares are formed: five 1x1 squares, one 2x2 square, and one 3x3 square. 2) What is unique about 8549176320 ? It is the digits 0 to 9 in  alphabetical  order. Note: it can also be exactly divided by all of the digits 1-9 except 7 (thanks to "The Hermit") 3) Answer : 35 4) Answer : 24 5) ANSWER:14 6) ANSWER: 22 7) Answer : 333
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