# 6.6: Circle Sums

**At Grade**Created by: CK-12

**Circle Sums - Solve for Values of Unknowns**

**Teacher Notes**

Circle Sums show three-by-three grids of circles that contain either letters that represent unknown quantities or numbers. Arrows point to sums of rows and columns. For example, in Row 1, , and in Column 1, . Students use grid relationships to figure out the values of the letters. Each grid contains three different letters and one number. Note: There is often more than one solution path.

**Solutions**

The arrows point to the sum of each row or column. Figure out the value of each letter.

1. The arrows point to the sum of each row or column. Figure out the value of each letter.

2. The arrows point to the sum of each row or column. Figure out the value of each letter.

3. The arrows point to the sum of each row or column. Figure out the value of each letter.

4. The arrows point to the sum of each row or column. Figure out the value of each letter.