Math worksheet for practicing addition facts that sum to 100 using multiples of 5.

Problem Analysis:

The task involves finding the missing numbers in each equation so that the sum equals 100. This is a straightforward arithmetic problem where we need to use basic addition and subtraction to solve for the unknowns.

Step-by-Step Solution:

#### Equation 1:
\[ 15 + \_\_\_ = 100 \]

To find the missing number, subtract 15 from 100:
\[
100 - 15 = 85
\]
So, the missing number is 85.

#### Equation 2:
\[ 35 + \_\_\_ = 100 \]

To find the missing number, subtract 35 from 100:
\[
100 - 35 = 65
\]
So, the missing number is 65.

#### Equation 3:
\[ \_\_\_ + 65 = 100 \]

To find the missing number, subtract 65 from 100:
\[
100 - 65 = 35
\]
So, the missing number is 35.

#### Equation 4:
\[ \_\_\_ + 85 = 100 \]

To find the missing number, subtract 85 from 100:
\[
100 - 85 = 15
\]
So, the missing number is 15.

#### Equation 5:
\[ 75 + \_\_\_ = 100 \]

To find the missing number, subtract 75 from 100:
\[
100 - 75 = 25
\]
So, the missing number is 25.

#### Equation 6:
\[ 5 + \_\_\_ = 100 \]

To find the missing number, subtract 5 from 100:
\[
100 - 5 = 95
\]
So, the missing number is 95.

#### Equation 7:
\[ \_\_\_ + 25 = 100 \]

To find the missing number, subtract 25 from 100:
\[
100 - 25 = 75
\]
So, the missing number is 75.

#### Equation 8:
\[ \_\_\_ + 15 = 100 \]

To find the missing number, subtract 15 from 100:
\[
100 - 15 = 85
\]
So, the missing number is 85.

#### Equation 9:
\[ 45 + \_\_\_ = 100 \]

To find the missing number, subtract 45 from 100:
\[
100 - 45 = 55
\]
So, the missing number is 55.

#### Equation 10:
\[ 85 + \_\_\_ = 100 \]

To find the missing number, subtract 85 from 100:
\[
100 - 85 = 15
\]
So, the missing number is 15.

#### Equation 11:
\[ \_\_\_ + 35 = 100 \]

To find the missing number, subtract 35 from 100:
\[
100 - 35 = 65
\]
So, the missing number is 65.

#### Equation 12:
\[ \_\_\_ + 75 = 100 \]

To find the missing number, subtract 75 from 100:
\[
100 - 75 = 25
\]
So, the missing number is 25.

#### Equation 13:
\[ 25 + \_\_\_ = 100 \]

To find the missing number, subtract 25 from 100:
\[
100 - 25 = 75
\]
So, the missing number is 75.

#### Equation 14:
\[ 95 + \_\_\_ = 100 \]

To find the missing number, subtract 95 from 100:
\[
100 - 95 = 5
\]
So, the missing number is 5.

Final Answer:

\[
\boxed{
\begin{array}{ll}
1. & 85 \\
2. & 65 \\
3. & 35 \\
4. & 15 \\
5. & 25 \\
6. & 95 \\
7. & 75 \\
8. & 85 \\
9. & 55 \\
10. & 15 \\
11. & 65 \\
12. & 25 \\
13. & 75 \\
14. & 5 \\
\end{array}
}
\]