Finding the Missing Number in a Sequence

This video tutorial explains how to find a missing number in a sequence when the mean is known. It begins by adding the known numbers to find their sum. Then, it uses the mean to calculate the total sum of the sequence. Finally, it subtracts the known sum from the total sum to determine the missing number.

What is the first step in finding the missing number in a sequence if the mean is known?

• Multiply all numbers by the mean

• Add up all known numbers in the sequence

• Subtract the mean from each number

• Divide the mean by the number of known numbers

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CCSS.4.OA.C.5

What is the sum of the known numbers in the sequence 8, 6, 4, 3, and 10?

• 31

• 42

• 28

• 35

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CCSS.6.SP.B.5C

How do you calculate the total sum of the sequence using the mean?

• Subtract the mean from the sum of known numbers

• Multiply the mean by the total number of numbers in the sequence

• Divide the mean by the number of known numbers

• Add the mean to the sum of known numbers

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CCSS.7.RP.A.3

If the mean of a sequence is 7 and there are 6 numbers in total, what is the total sum of the sequence?

• 31

• 42

• 35

• 28

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CCSS.6.SP.B.5C

Why is it necessary to multiply the mean by the total number of numbers in the sequence?

• To find the average of the sequence

• To determine the total sum of the sequence

• To verify the mean calculation

• To calculate the missing number directly

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CCSS.2.OA.A.1

What operation is used to find the missing number once the total sum and known sum are calculated?

• Addition

• Division

• Multiplication

• Subtraction

What is the missing number in the sequence if the total sum is 42 and the sum of known numbers is 31?

• 12

• 11

• 10

• 9