Erin takes 37 minutes to run the cross country. Brian takes 9 minutes more than Erin. How long does Brian take? |
 (enlarge) |
Student: Thirty-seven... Thirty-eight, Thirty-nine, forty, forty-one, forty-two, forty-three, forty-four, forty-five, forty-six. |
|
Students at the Advanced Counting stage understand that the end number in a counting sequence measures the whole set and can relate the addition or subtraction of objects to the forward and backward number sequences by ones, tens, etc. |
|