### Home > CAAC > Chapter 1 > Lesson 1.2.1 > Problem 1-44

Find out what values are missing from the diamond.(Is the *x*-value missing? *Y*-value? *XY* value? *X + y* value?)

If the *x* and *y* value are missing, find what values can equal the top number, and what values equal the bottom number.

If the *xy* value and the *x + y* value are missing, use the values you do have (the *x* value and the *y* value) and multiply them together for the top value and add them together for the bottom value.

If the *x + y* value and the *y* value are missing: To find *y*: Find what number multiplied by *x* equals the top number.To find *x + y*: Use the *y* value you found and the *x* value given and add them together.

If the *xy* and *y* value are missing: To find *y*: Use the *x* value given and the *x+y* value and subtract the *x* value from the *x+y* value. To find *xy*: Use the *y* value you found and the *x* value given and multiply.