Euclid's Muse
your source for INTERACTIVE math apps
Whimsical Clocks Ch.2 Abacus Clock
Like your hands, an abacus lets you count in fives and tens. The first pair of columns are for hours, the second pair for minutes and the third pair for seconds. The bead at the top of each column counts for 5 single beads. The beads in the main compartment of the left column each count for 10 single beads. The bead in the top compartment, left column, counts as 50.Enter Collection »
Collection Contents:
Abacus Clock
It has been brought to our attention that this clock is, in some sense, upside down! The 5's beads in the top section are going up to indicate 5, instead of down. To get the conventional Abacus model, go to the Abacus Corrected in this collection: http://euclidsmuse.com/app?id=1016.
Abacus Corrected
An abacus clock. Our previous version illustrated an idiosyncratic use of the abacus. In this version, we conform to international standards: the value of the "five" bead is 0 when it is in the upper position, and 5 in the lower position.
Abacus Explained
The bead at the top of each column counts for 5 beads in the main compartment in that column. The beads in the main compartment of the left column each count for 10 single beads. The bead in the top compartment of the left column counts as 50. But the top compartment is upside down in this app. To learn the correct Abacus model, go to Abacus Explained Properly in this collection: http://euclidsmuse.com/app?id=1017.