Calculatingmachines Oneofthefirstcalculatingmachineswasanabacus.Abacusesarefastandaccurate,sopeoplestillusethemtoday.Ontheabacusinthepicture,thebeadsonthewiresrepresentones,tens,hundredsandthousandsstartingfromthebottomwire. Now,weusemoderncalculators.Thepictureontherightshowsamoderncalculator.Itcanadd,subtract,...
The picture on the right shows a modern electronic calculator.It can add subtract multiply and divide.It can also calculate percentages and 14 roots. This picture shows a computer.Computers are very 15 calculating machines.In a flash a computer can do a calculation that you could not do in ...
an abacus.Abacuses are fast and accurate.On theabacus,the beads on the wires stand for ones,tens,hundreds and thousands,starting from the bottom wire.The abacus in the picture shows a number.Writeit down in figures and then in words.Multiply it by zero and then add 1.Whatis the answer?