Number each card in a set of 21 3-by-5 cards with an integer from to 10. Lay the cards...

Number each card in a set of 21 3-by-5 cards with an integer from to 10. Lay the cards on the floor to form a number line. Choose someone from your group to act like the hiker on the student pages for number-line addition and subtraction. Give the hiker directions to walk the number line to solve problems 5 and 9 in Problem Set 5-1A. Try other addition and subtraction problems to make sure that the number-line model is understood by everyone in your group and could be used in an elementary classroom.

Reference: Problem Set 5-1 A