Examples with solutions for Powers: Complete the missing number

Exercise #1

Fill in the missing number:

6=222222 ☐^6=2\cdot2\cdot2\cdot2\cdot2\cdot2

Video Solution

Step-by-Step Solution

To solve this problem, we have to determine the missing number in the expression 6=222222 ☐^6 = 2 \cdot 2 \cdot 2 \cdot 2 \cdot 2 \cdot 2 .

Let's follow these steps:

  • Step 1: Recognize that the right side of the equation, 222222 2 \cdot 2 \cdot 2 \cdot 2 \cdot 2 \cdot 2 , is equivalent to 26 2^6 , as it involves multiplying six 2s together.
  • Step 2: The left side of the equation 6 ☐^6 means some number raised to the power of 6.
  • Step 3: Since the two sides must be equal, we recognize that the base on both sides must be the same if the exponents are equal. Hence, the missing base number, represented by , is 2 2 .

When we match the two expressions based on exponents, we find that the correct base completing the equation 6=26 ☐^6 = 2^6 is 2 2 .

Therefore, the missing number is 2 \mathbf{2} .

Answer

2

Exercise #2

Fill in the missing number:

3=555 ☐^3=5\cdot5\cdot5

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Evaluate the power expression 5555 \cdot 5 \cdot 5
  • Step 2: Determine the number whose cube matches this evaluated expression
  • Step 3: Conclude with the missing number that satisfies 3=555☐^3 = 5 \cdot 5 \cdot 5

Now, let's work through these steps:

Step 1: Calculate the power expression.

555=1255 \cdot 5 \cdot 5 = 125

Step 2: Determine the cube root of 125 to find the missing number.

Since 53=1255^3 = 125, it follows that the missing number must be 5.

Step 3: Verify that 53=1255^3 = 125.

Therefore, the solution to the given problem is 55.

Answer

5

Exercise #3

Fill in the missing number:

0=0 0^☐=0

Video Solution

Step-by-Step Solution

To solve this problem, we need to understand how powers with a base of zero work. Typically, for any positive integer nn, raising zero to that power results in zero, as follows:

  • 0n=00^n = 0 for n>0n > 0.

Therefore, to satisfy the equation 0=00^\square = 0, the exponent \square should be any positive integer. Hence, the missing number that makes the equation true is simply any positive integer.

Therefore, the correct answer is a (any number), which corresponds to any positive integer number.

Answer

a (any number)

Exercise #4

Fill in the missing number:

12=121212 12^☐=12\cdot12\cdot12

Video Solution

Step-by-Step Solution

The missing number is 3.

Answer

3

Exercise #5

Fill in the missing number:

4=4444 4^☐=4\cdot4\cdot4\cdot4

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify how many times 4 is multiplied by itself in the expression 44444 \cdot 4 \cdot 4 \cdot 4.
  • Step 2: Determine the exponent that matches this count.

Now, let's work through each step:
Step 1: In the expression 44444 \cdot 4 \cdot 4 \cdot 4, the base number 4 is multiplied by itself 4 times.
Step 2: According to the rule of exponents, ana^n is the notation for a number aa multiplied by itself nn times.

Therefore, the correct exponent for 44 in the expression is 4, so the missing number is 4\mathbf{4}. The complete expression is 444^4.

Therefore, the solution to the problem is 4 4 .

Answer

4

Exercise #6

Fill in the missing number:

7=15151515151515 ☐^7=\frac{1}{5}\cdot\frac{1}{5}\cdot\frac{1}{5}\cdot\frac{1}{5}\cdot\frac{1}{5}\cdot\frac{1}{5}\cdot\frac{1}{5}

Video Solution

Step-by-Step Solution

To solve this problem, we'll begin by simplifying the expression on the right side of the equation:

7=15151515151515 ☐^7 = \frac{1}{5} \cdot \frac{1}{5} \cdot \frac{1}{5} \cdot \frac{1}{5} \cdot \frac{1}{5} \cdot \frac{1}{5} \cdot \frac{1}{5}

Using the laws of exponents, multiplying the fraction 15\frac{1}{5} by itself seven times can be expressed as:

(15)7 \left(\frac{1}{5}\right)^7

Now, the equation becomes:

7=(15)7 ☐^7 = \left(\frac{1}{5}\right)^7

Since the exponents on both sides of the equation are the same, the bases must be equal as well. Therefore, =15 ☐ = \frac{1}{5} .

Thus, the missing number is:

15 \frac{1}{5}

Answer

15 \frac{1}{5}

Exercise #7

Fill in the missing number:

7=1 ☐^7=1

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify potential values for the missing number \square.
  • Step 2: Verify if it fits the equation 7=1☐^7 = 1.
  • Step 3: Consider alternative numbers from intuitive mathematics.

Now, let's work through each step:
Step 1: We hypothesize that the number could be 1, given that raising 1 to any power yields 1.
Step 2: Verify (1)7=1(1)^7 = 1, which is true since any real number 1 raised to any integer power remains 1.
Step 3: As a check for understanding: with odd powers greater than 1, attempts with 1-1 as choices lead to (1)7=1(-1)^7 = -1, which doesn’t meet the requirement, reinforcing =1☐ = 1.

Therefore, the solution to the problem is 1, choice number 4.

Answer

1

Exercise #8

Fill in the missing number:

15=1515151515 \frac{1}{5}^☐=\frac{1}{5}\cdot\frac{1}{5}\cdot\frac{1}{5}\cdot\frac{1}{5}\cdot\frac{1}{5}

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Count the number of times 15 \frac{1}{5} is used as a factor in the product given.
  • Step 2: Use this count as the exponent in the expression 15 \frac{1}{5}^☐ .

Now, let's work through each step:
Step 1: The expression 1515151515 \frac{1}{5} \cdot \frac{1}{5} \cdot \frac{1}{5} \cdot \frac{1}{5} \cdot \frac{1}{5} shows that the base 15 \frac{1}{5} is used 5 times.
Step 2: Therefore, the exponent that makes the expression (15) \left( \frac{1}{5} \right)^☐ equal to the product is 5.

Therefore, the missing number in the expression 15 \frac{1}{5}^☐ is 5 5 .

Answer

5

Exercise #9

Fill in the missing number:

1a=1a1a1a1a1a1a \frac{1}{a}^☐=\frac{1}{a}\cdot\frac{1}{a}\cdot\frac{1}{a}\cdot\frac{1}{a}\cdot\frac{1}{a}\cdot\frac{1}{a}

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the structure of the exponentiation in the problem.
  • Step 2: Count the number of terms multiplied on the right-hand side.
  • Step 3: Equate the number of terms to the exponent, thereby finding the missing number.

Now, let's work through each step:

Step 1: The problem provides the expression: 1a \frac{1}{a}^☐ on the left-hand side, and 1a1a1a1a1a1a\frac{1}{a} \cdot \frac{1}{a} \cdot \frac{1}{a} \cdot \frac{1}{a} \cdot \frac{1}{a} \cdot \frac{1}{a} on the right-hand side.

Step 2: Count the number of 1a\frac{1}{a} terms on the right. There are 6 terms.

Step 3: The property of exponents allows us to say (1a)\left(\frac{1}{a}\right)^☐ should equal to 1a\frac{1}{a} multiplied by itself 6 times. Thus, the exponent on the left, indicated by ☐, must match the count of the terms:

Therefore, the missing number for ☐ is 6 6 .

Answer

6

Exercise #10

Fill in the missing number:

x=xxxxxx x^☐=x\cdot x\cdot x\cdot x\cdot x\cdot x

Video Solution

Step-by-Step Solution

To solve this problem, we'll adopt the following method:

  • Step 1: Understand the given expression in multiplication form: xxxxxx x \cdot x \cdot x \cdot x \cdot x \cdot x .
  • Step 2: Count the number of times x x appears.
  • Step 3: Determine that the expression is equivalent to xn x^n , where n n is the count of x x factors.

Now, let's work through these steps:

Step 1: We are given the product xxxxxx x \cdot x \cdot x \cdot x \cdot x \cdot x , which is clearly a multiplication of x x six times.

Step 2: Counting these, we see that x x appears 6 times.

Step 3: Therefore, the product can be expressed as x6 x^6 , meaning that the expression x=xxxxxx x^☐ = x \cdot x \cdot x \cdot x \cdot x \cdot x implies that =6 ☑ = 6 .

Thus, the missing number is 6, corresponding to choice 2.

Answer

6