Abacus History
Who was the Cranmer abacus named after?
Tim Cranmer
What do you use to count on an abacus ?
beads
What year was the Cranmer abacus invented?
1962
What shows place value separates beads into 'periods"
dots and unit marks
What does the last column on the right count?
Ones
What was the Cranmer abacus adapted from?
The Japanese abacus
What is something that makes the Cranmer abacus special?
It has felt in back so the beads don't slide
"Set" means
add a number
What side do you start counting on the abacus?
The right side in the ones column
What does the column on the left of the ones count?
Tens
Used as a "__" and "__" for students with visual impairments
paper and pencil
How many beads are on top of a Cranmer abacus?
one bead on top
What is faster to do math? Abacus or braille writer?
Abacus
How high up in numbers does the Cranmer abacus go up to?
One trillion
What does the column on the left of the tens count?
Hundreds
Used to teach ____
math concepts
How many beads are below the center bar of the Cranmer abacus?
four beds below the center bar
"Clear" means
remove a number
Beads move toward the ____ to set their value
bar
What does the column on the left of the hundreds count?
Thousands
How old is the abacus?
over 2000 years
How many columns does a Cranmer abacus have?
thirteen (13)
Why is the Cranmer abacus important to use in school?
It is the only abacus allowed for tests
What is the separation bar or center bar?
It separates the top beads from the bottom beads
What does the column on the left of the ten thousands count?
hundred thousands