Using the Decad and Digits on a Hand to Explore Patterns of Adding to and Subtracting from 5.
  • 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.
  • 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.
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