Find the value of each sum.
Show your thinking using drawings, numbers, or words.

Find the value of each sum.
Show your thinking using drawings, numbers, or words.

Find the value of each sum.
Show your thinking using drawings, numbers, or words.

3. How are the problems alike?

   How are they different?

Exploration

Choose 5 numbers from below to make a sum with a value greater than 50 but less than 99.

Use equations or drawing to show your thinking.

Here is how Lin found the value of .

“I know . Then I add 5 tens and get 67.”

1. Why does Lin's method work?
   Show your thinking using drawings, numbers, or words.

2. Use Lin's method to find the value of .

Noah’s brother spilled water on his math work.
Help Noah figure out the unknown number.

1. The unknown number makes the value of the sum greater than 50. The sum has a 0 in the ones place.

   

   What could the unknown number be?

2. The unknown number is a 2-digit number.
   It makes the value of the sum 75.

   

   What could the unknown number be?

3. The unknown number is a 2-digit number.
   It makes a value that is more than 80 but less than 90.

   

   What could the unknown number be?

Priya is playing the game Target Numbers.
Priya starts at 25. She picks these 6 cards:

She chooses to add that many tens or ones for each card.
What is the highest score she can get without going over 95?
Use equations to show your thinking.