The video tutorial explains how to find an unknown value in a number sentence. It presents two methods: balancing the equation by comparing both sides and calculating the unknown by summing known values. The unknown value is determined to be 3. The video concludes with a call to action to like and subscribe for more content.

What is an unknown value in a number sentence?

• A value that is given explicitly

• A value that is missing and needs to be found

• A value that is always zero

• A value that is always negative

In the given number sentence, what is the expression on the left side?

• 70 plus 20

• 70 plus 20 plus 10

• 10 minus the unknown value

• 90 plus 7

What is the expression on the right side of the given number sentence?

• 70 plus 20 plus 10 minus the unknown value

• 70 plus 20

• 10 minus the unknown value

• 90 plus 7

In the first method, what is the value on the left side that needs to be balanced with the right side?

• 90

• 7

• 20

• 10

According to the first method, what should 7 be equal to for the equation to balance?

• 7 minus the unknown value

• 10 minus the unknown value

• 7 plus the unknown value

• 10 plus the unknown value

What is the unknown value according to the first method?

• 4

• 5

• 3

• 2

In the second method, what is the total value on the left side of the equation?

• 100

• 97

• 90

• 110

What is the total value on the right side before subtracting the unknown value in the second method?

• 110

• 100

• 97

• 90

How is the equation written in the second method after calculating the total values?

• 100 is equal to 97 minus the unknown value

• 100 is equal to 97 plus the unknown value

• 97 is equal to 100 minus the unknown value

• 97 is equal to 100 plus the unknown value

What is the unknown value according to the second method?

• 2

• 3

• 5

• 4