Practice!

Sample Problem

What fact is missing from this fact family? Type the sentence in the blank.

10 + 30 = 40

40 - 30 = 10

40 - 10 = 30

 

Solution

In addition, the result must be the largest number 40 and the addend can be 10 or 30.

In subtraction, the minuend must be the largest number 40 and the subtrahend can be 10 or 30.

Thus, the missing sentence is: 30 + 10 = 40