The purpose of this activity is for students to find pairs of numbers that have a value that is between 35–65. Some students may use trial and error to solve the problem. Encourage students to consider a strategic way to determine if a combination of two classes may or may not meet the constraint. For example, students may notice that combining 1st and 2nd grade will not work because 5 tens and 2 tens is 7 tens which is more than the 65 can limit.

• “Is this statement true? 6th grade’s cans can be packed with any other grade level.” (Yes, since they only collected 8 cans and the highest amount of cans collected was 51 in 1st grade. , which is still under 65 cans.)
• "Is this statement true? 1st grade's cans can't be packed with any other grade level." (No, 1st grade's cans can be packed with either 3rd grade's cans or 6th grade's cans.)

• Invite students to share which way of packing the cans makes the most sense to them and why they think so.