abacus
Manual counting frame
An abacus is a manual counting device consisting of a frame with rods or wires along which beads slide.
Used for arithmetic calculations, it predates written numerals and remains in use in parts of Asia.
She learned to add and subtract on an abacus before using a calculator.
Small pierced ornaments for stringing
- reckoningSettlement of accounts
- computeDetermine by calculation
- additionJoining quantities mathematically
- subtractionRemoving quantities mathematically
multiplication · division · tally · rows · columns · manipulate · calculate · total
Mathematics of basic operations
- place valueDigit worth by position
- decimalTenths-based notation
- operationsPlanned systematic activities
- mental calculationMath done in mind
number sense · carry · borrow · digits · numerical · computation · algorithm
Tigris-Euphrates river region
- ChinaEast Asian superpower
- BabylonAncient Mesopotamian capital
- SumeriaAncient southern Mesopotamian civilization
- antiquityGreat age, ancient era
artifact · archaeology · ancient · heritage · relic · Roman · Greek · Egyptian
Supporting outer structure
- woodTree-derived building material
- beadsSmall pierced ornaments for stringing
- rodsThin cylindrical shafts
- wiresMetallic electrical conductors
columns · rows · bamboo · counters · mechanism · tool · manual · portable
Gaining knowledge gradually
- teachingProfession of instructing others
- pedagogyArt of instruction
- numeracyAbility with figures
- classroomEducational instruction space
manipulative · Montessori · visual learning · students · instruction · curriculum · arithmetic · demonstration
Agitation or fingerboard guide
- moldingDecorative architectural edging
- ornamentThing that beautifies
- capitalWealth used for investment
- columnVertical structural element
Doric · Ionic · Corinthian · entablature · slab · classical · decorative
beads
Small pierced ornaments for stringing
- reckoningSettlement of accounts
- computeDetermine by calculation
- additionJoining quantities mathematically
subtraction · multiplication · division · tally · rows · columns · manipulate · calculate · total · sum
arithmetic
Mathematics of basic operations
- place valueDigit worth by position
- decimalTenths-based notation
- operationsPlanned systematic activities
mental calculation · number sense · carry · borrow · digits · numerical · computation · algorithm
Mesopotamia
Tigris-Euphrates river region
- ChinaEast Asian superpower
- BabylonAncient Mesopotamian capital
- SumeriaAncient southern Mesopotamian civilization
antiquity · artifact · archaeology · ancient · heritage · relic · Roman · Greek · Egyptian · civilization
frame
Supporting outer structure
- woodTree-derived building material
- beadsSmall pierced ornaments for stringing
- rodsThin cylindrical shafts
wires · columns · rows · bamboo · counters · mechanism · tool · manual · portable · handheld
learning
Gaining knowledge gradually
classroom · manipulative · Montessori · visual learning · students · instruction · curriculum · arithmetic · demonstration · hands-on
fret
Agitation or fingerboard guide
- moldingDecorative architectural edging
- ornamentThing that beautifies
- capitalWealth used for investment
column · Doric · Ionic · Corinthian · entablature · slab · classical · decorative
- obsolete thingsdodo, dodo bird, passenger pigeon, dinosaurs, mammoth
- analog devicesanalog clock, mechanical clock, vinyl, pocket watch, stopwatch
- antique instrumentsastrolabe, sextant, octant, quadrant, theodolite
- Asian inventionsgunpowder, paper money, compass, silk production, movable type
- calculating machinescalculator, adding machine, difference engine, desk calculator, slide rule
- ancient calculatorstally stick, quipu, slide rule
abacuscomputer
Electronic calculating device
supercomputer · electronic calculator · smartphone · digital computer · laptop
abacusestimation
Approximate value judgment
guesswork · approximation · ballpark figure · eyeballing · intuition