How did you keep track as you were counting?
Possible answers: I counted one row at a time; I touched each one; I crossed them out.
If one more button was added, how many would there be?
13 buttons. Look for students to count on 1 from 12, rather than needing to really add 1 and count them all again.
How did you keep track as you were counting?
Possible answers: I touched each one and marked where I started; I crossed them out.
If one more button was added, how many would there be?
18 buttons. Look for students to count on 1 from 17, rather than needing to really add 1 and count them all again.
How did you keep track as you were counting?
Possible answers: I touched each one; I crossed them out.
If one more button was added, how many would there be?
9 buttons. Look for students to count on 1 from 8, rather than needing to really add 1 and count them all again.
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