Why 10?. Why 10? O ur number system is based and built by 10’s. It originated because we have 10 fingers—how the first person began counting. Presented by Joan Kernan and Donna Kouri. Research for Number Sense. National Council for Mathematics Elementary and Middle School Mathematics:
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Why 10? Our number system is based and built by 10’s. It originated because we have 10 fingers—how the first person began counting.
Presented by Joan Kernan and Donna Kouri
National Council for Mathematics
Elementary and Middle School Mathematics:
Key ideas include:
We will be looking closely at numbers, and
how much each number is worth; what makes
that number that number.
This session is designed to help young elementary children see numbers within numbers. The goal is NOT to master these techniques within one math lesson.
The games today will strengthen the child’s understanding of the values of numbers.
This is playing with numbers and learning during the journey.
The idea of Seeing Numbers is the ability to recognize the value of a number without counting.
This is officially known as Subitizing. By seeing numbers as groups rather than the result of counting single units or counting on, children are able to conceptualize groups of numbers and how they can be combined to make new numbers.
The value of this demonstration:
Large-- need a volunteer
distinguish between the immediate known and
and the cards with hesitation
Small– individualizing the instruction
Shows numbers with one color.
Allows you to look at visual patterns/placement of two-sided counters
Show numbers with two different colors
The Rekenrek was designed
at the Freudenthal Institute
The term Rekenrek means calculating frame or arithmetic rack.
The Rekenrek may resemble
an abacus. The abacus is based
on place value columns.
The Rekenrek features two rows of ten 10 beads and each row is broken into two sets of five.
You will need:
… and the winners are…