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if you have Matrix of number and youamp;#39;re trying to find the summation of the column this 20 comes about by adding 10 plus 7 plus 2 plus 1 which are all numeric values these are ignored because they are string or text to convert each cell into a number you go here and you do convert but youamp;#39;re doing one at a time the one way to get around this would be to select the very first cell which is a text and drag it right across like this and then go through the same process of converting that into number the idea behind that is so long as you select the very first cell which is a text and even if here you press Ctrl a and you do this you can convert them into number another way to get around that would be to put a 1 here and then select the one again press Ctrl C to copy that and select the area that you want to convert them into numeric value go here pull down paste special and multiply