Sudoku Answers
Sunday, December 29, 2019
Saturday, December 21, 2019
Easy Maths Puzzles with Answers for Children
1. Ramesh turned 10 years old day before yesterday. By next year he will become 13. How is this possible?
ADVERTISEMENT
Answer: This is one of the more amusing maths puzzles for kids age 6. With the help of math and a calendar, this puzzle can be easily explained.
For this puzzle to work, we need to assume that today is 1st January 2018. This means that Ramesh’s eleventh birthday was on 31st December 2017. Day before yesterday, he was 10 years old, today he is 11. By the end of the current year, 2018, he will be 12 years old. And so, by the next year (i.e. in 2019), he will be 13 years old.
2. What is the following number? 18, 21, 24, 27, 30, 33, 36, ______________
Answer: Here the pattern to be observed is: every successive number is greater by 3. So the sequence will be: 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, and so on.
3. What is the following number? 53, 51, 49, 47, 45, 43, _______________
Answer: Here the pattern to be observed is: every successive number is smaller by 2. So the sequence will be: 53, 51, 49, 47, 45, 43, 41, 39, 37, 35, and so on.
4. Hari had 6 siblings who were born all born 2 years apart. The youngest is Richa who is only 7 years old while Hari is the oldest. What is Hari’s age?
Answer: Richa, the youngest sibling is 7 years old. Each sibling was born 2 years apart, and there are total seven children (Hari and his 6 siblings). So Hari’s age is: 7 + 2 + 2 + 2 + 2 + 2 + 2 = 19.
Mathematics Article
Using math and mechanics to explain how bivalve shells fit together so well
December 17, 2019 by Bob Yirka, Phys.org
Using math and mechanics, a trio of researchers, two from the University of Oxford, the other the University of Lyon, have learned more about how bivalve shells fit together so well. In their paper published in Proceedings of the National Academy of Sciences, Derek Moulton, Alain Goriely and Régis Chirat describe their approach to understanding the interlocking mechanism of bivalve shells.
Many people who have handled a bivalve creature, such as a clam or oyster, have marveled at how seamlessly the top and bottom shells fit together. The researchers with this new effort noted that such close-fitting shells evolved in two phyla from a common ancestor. They also noted that even irregularities, whether natural or from an injury, do not generally prevent shells from neatly closing—and it works equally well in bivalves with either flat or wavy edges. The researchers also noted that the near-perfect alignment of edge features happens despite the two edges forming from two distinct mantle lobes.
To explain how such a near-perfect alignment arises in the bivalves, the researchers created a mathematical model of the shell growth process. They started by noting that the edges of the bivalve shells grow throughout the creature's life—they also noted that there are differences in modes of secretion and general anatomy between bivalves and brachiopods (the other phyla with matched shell halves). But they also noted that with both groups, the shells are incrementally secreted by a mantle—a thin membrane-like organ. They further noted that the mantle secretes a soft layer that functions as a matrix for the formation of the calcium carbonate shell.
They next took into consideration the geometry of the shell halves and the mechanics involved when they come together, and the constraints involved. They used such factors to develop a model that showed how such evenly matched shells could arise. The reason the edges in some species are wavy is because the mantle grows at a faster pace than the shell edge, resulting in buckling. The interlocking pattern that emerges, they found, is constrained by the forces of the shells when closed.
Fun Facts
October 14th is celebrated as World Maths Day. Let us know some interesting and amazing facts about Mathematics.
1. Zero ( 0 ) is the only number which can not be represented by Roman numerals.
2. What comes after a million, billion and trillion? A quadrillion, quintillion, sextillion, septillion, octillion, nonillion, decillion and undecillion
3. Plus (+) and Minus (-) sign symbols were used as early as 1489 A.D
4. 2 and 5 are the only primes that end in 2 or 5
5. An icosagon is a shape with 20 sides
6. Among all shapes with the same perimeter a circle has the largest area.
7. Among all shapes with the same area circle has the shortest perimeter
8. 40 when written "forty" is the only number with letters in alphabetical order, while "one" is the only one with letters in reverse order
9. 'FOUR' is the only number in the English language that is spelt with the same number of letters as the number itself
10. From 0 to 1,000, the letter "A" only appears in 1,000 ("one thousand")
Subscribe to:
Posts (Atom)