Solving Unknown Amounts Using Addition and Subtraction Fact Families

The video tutorial explains how to use addition and subtraction fact families to solve equations with unknown values. It demonstrates creating fact families using examples and shows how to solve problems with missing addends or unknown sums. A word problem is also solved using these techniques, emphasizing the importance of understanding related equations in a fact family.

What is the largest number in a fact family triangle?

• The smallest add-in

• The sum

• The difference

• The first add-in

Which of the following is NOT a part of a fact family for the numbers 17, 8, and 25?

• 17 - 8 = 9

• 8 + 17 = 25

• 17 + 8 = 25

• 25 - 8 = 17

If you have the equation 9 plus blank equals 22, what is the missing number?

• 11

• 13

• 15

• 17

In a fact family, if the equation is blank minus 6 equals 38, what is the unknown total?

• 42

• 44

• 46

• 48

How many marshmallows were originally in the bag if 26 were eaten and 7 are left?

• 31

• 30

• 32

• 33