[QUOTE] Well if you can do 78.4 * 49 in your head you probably went to a better school than I did..[/QUOTE] That's a fairly easy piece of mental arithmetic. 49 is one short of 50, which is half of one hundred. 78.4 times 100 = 7840, divide by two = 3920. 78.4 is 1.6 less than 80. 3920 minus 80 = 3840 and add back the 1.6, gives 3841.6. Of course, when I was at primary school, we would have worked in fractions. Decimals were an advanced concept. Colin Bignell