Find the value of \(35 + 48\).
Show your thinking using drawings, numbers, or words.

1. Find the value of \(16 + 55\).
   Show your thinking using drawings, numbers, or words.

2. Can you find the value in a different way?

Use your favorite method to find the value of \(34 + 59\).

Why do you like the method you chose?

Choose a 2-digit number to add to 46 so that you make a new 10.
Add the numbers.
Write equations to show your thinking.

Elena has a way to find the value of \(28 + 47\) without making a 10. Here is her work.

\(30 - 2 = 28\)
\(50 - 3 = 47\)
\(80 - 5 = 75\)

1. Explain why Elena's work is correct. Use connecting cubes if it is helpful.
2. Use Elena's method to find the value of \(39 + 55\).

Diego and his friends are working on the same addition problem.

1. What is the addition problem Diego and his friends are working on?

2. Which method is your favorite?

   Solve \(56 + 28\) using your favorite method.

Clare wrote some expressions.
Each expression makes a ten.
She spilled water on her work.
Find the digit that could be under each water mark.