http://nrich.maths.org/public/index.php?rss=1 No theme en Sun, 01 Nov 2009 00:00:00 +0000 http://nrich.maths.org/media/logoC93366.gif http://nrich.maths.org/ Choose a symbol to put into the number sentence. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6777&part=index What could these drawings, found in a cave in Spain, represent? http://nrich.maths.org/public/viewer.php?rss=1&obj_id=2472&part=index Here is your chance to investigate the number 28 using shapes, cubes ... in fact anything at all. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6778&part=index Can you help the children in Mrs Trimmer's class make different shapes out of a loop of string? http://nrich.maths.org/public/viewer.php?rss=1&obj_id=2907&part=index You found many different ways of finding the number on the reverse of the hundred square. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=2397&part=solution In this article Jenny talks about Assessing Pupils' Progress and the use of NRICH problems. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6834&part=index Investigate and explain the patterns that you see from recording just the units digits of numbers in the times tables. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=4905&part=index Can you find ways of joining cubes together so that 28 faces are visible? http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6779&part=index There are ten children in Becky's group. Can you find a set of numbers for each of them? Are there any other sets? http://nrich.maths.org/public/viewer.php?rss=1&obj_id=2660&part=index In a square in which the houses are evenly spaced, numbers 3 and 10 are opposite each other. What is the smallest and what is the largest possible number of houses in the square? http://nrich.maths.org/public/viewer.php?rss=1&obj_id=717&part=index Read the different justifications of the result of this problem. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=2280&part=solution In this article Jenny talks about Assessing Pupils' Progress and the use of NRICH problems. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6834&part=index A game that tests your understanding of remainders. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6402&part=index In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time? http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6863&part=index Can you find a way to identify times tables after they have been shifted up? http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6713&part=index Mathematicians are always looking for efficient methods for solving problems. How efficient can you be? http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6651&part=index How could Penny, Tom and Matthew work out how many chocolates there are in different sized boxes? http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6675&part=index This was a popular problem and many people have contributed to its solution. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6708&part=solution In this article Jenny talks about Assessing Pupils' Progress and the use of NRICH problems. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6834&part=index A game that tests your understanding of remainders. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6402&part=index In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time? http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6863&part=index Can you explain the surprising results Jo found when she calculated the difference between square numbers? http://nrich.maths.org/public/viewer.php?rss=1&obj_id=658&part=index Use your skill and knowledge to place various scientific lengths in order of size. Can you judge the length of objects with sizes ranging from 1 Angstrom to 1 million km with no wrong attempts? http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6349&part=index Many numbers can be expressed as the difference of two perfect squares. What do you notice about the numbers you CANNOT make? http://nrich.maths.org/public/viewer.php?rss=1&obj_id=742&part=index This problem was solved using visual techniques as well as proof by induction. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=325&part=solution In this article Jenny talks about Assessing Pupils' Progress and the use of NRICH problems. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6834&part=index Investigate Farey sequences of ratios of Fibonacci numbers. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6599&part=index Use Farey sequences to obtain rational approximations to irrational numbers. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6596&part=index How do you choose your planting levels to minimise the total loss at harvest time? http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6437&part=index Can you find the maximum value of the curve defined by this expression? http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6406&part=index Investigate the effects of the half-lifes of the isotopes of cobalt on the mass of a mystery lump of the element. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6560&part=index Small circles nestle under touching parent circles when they sit on the axis at neighbouring points in a Farey sequence. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6594&part=index In this article Jenny talks about Assessing Pupils' Progress and the use of NRICH problems. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=6834&part=index This article sets some puzzles and describes how Euclid's algorithm and continued fractions are related. http://nrich.maths.org/public/viewer.php?rss=1&obj_id=1397&part=index