Counting: skip & coral counting

Skip counting by two song!


Skip counting or choral counting can be a problem strategy and a device to develop fluency when used as a review, or warm-up activity, within a lesson, or as closure.

Can vary how count by

Procedural considerations

Assessment considerations



Count by 2s and explore patterns in the sequence. bar


  1. Count by 2s.
  2. Make a list of groups of twos.
  3. What do you notice about the numbers?
  4. Organize them into rows and columns.
  5. What patterns do you notice?


Count orally: zero, two, four, six, eight, ten, twelve, fourteen, sixteen, eighteen, twenty, ...

Write the digits:

0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 26, 28, 30, ...


Record the group and number of twos in each group ...

Number of groups 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20


Patterns for the digits ...


What about group 100?

Group ...

What patterns can you find when you arrange them in a grid starting a new row when the digits repeat?

Like sample relationships below.

Sample to coral skip count and add notes


Twos in grid


Some patterns:


Source: Extending Choral Counting. Mathematics Teacher: Learning & teaching PK-12.
by Brandon G. McMillan & Theodore Sagun. 8 August 2020.


Sample with relationships

Learners can enter relationships for pairs of numbers.

For example ...

Skip counting by twos and relationships

As they do they will discover the notation can get fairly compicated quickly. One way to solve the problem would be to use multiple diagrams and decide how to limit the relationships for each. For example all +2 on one sheet and all +10 on another...


What will a graph look like for the relationship for groups and number of twos?

What will be the difference if the number of groups are graphed as x-values and totals as y-values vs. the number of groups as y-values and totals as x-values.

Grid 20x20



Dr. Robert Sweetland's notes
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