- Equations represented by sums of dots in
the decad.
- Click on two rolls of dots that add up to 5.
- Next click one of the two rolls of black dots or click
another gray roll of dots.
- Click the answer button to see an aritmetic equation .
- The equation will equate the number of remaining black dots
to a sum or difference statement including the number 5
- The revealed patterns can be related to
a finger counting approach that represents the number 5 as the
thumb.
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- This allows counting to 9 on one hand.
- Extended fingers or added to the extended thumb to represent
the numbers 6 to 9.
- Unextended fingers and the covering thumb are subtracted
from 5 to leave a difference represented by the extended
fingers.
- Create worksheets of white dot decads.
- Then students can do paper work by circling two rows of dots
that sum to 5.
- Next students would color in the dots of one or both the
rows and an additional row of the decad..
- Coloring one row, when the row of 3 dots is colored
represents the subtraction equation 3 = 5 - 2.
- Coloring both rows summing to 5, when an additional row of 1
dot is colored represents the equation 6 = 5 + 1.
- Next Page
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