Sentence Solvers: How to Completing Addition and Subtraction Equations

Completing Subtraction and Addition Sentences

Example 1:

Complete the sentence: \( ___ + 7 = 15 \).

Solution Process:

To find the missing number, subtract \(7\) from \(15\).

Answer:

The missing number is \(8\). So, the completed sentence is \(8 + 7 = 15\).

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Example 2:

Complete the sentence: \( 20 – ___ = 13 \).

Solution Process:

To find the missing number, subtract \(13\) from \(20\).

Answer:

The missing number is \(7\). So, the completed sentence is \(20 – 7 = 13\).

Completing addition and subtraction sentences is a fundamental skill in mathematics. It helps in understanding the relationship between numbers and operations. By rearranging the equation and performing the inverse operation, you can easily find the missing number. This skill is not only essential for academic purposes but also for everyday scenarios where you might need to solve for unknowns. Keep practicing, and you’ll become a pro at completing these mathematical sentences!

Practice Questions:

1. Complete the sentence: \( ___ + 9 = 24 \).

2. Complete the sentence: \( 35 – ___ = 20 \).

3. Fill in the blank: \( ___ + 12 = 40 \).

4. Complete the equation: \( 50 – ___ = 43 \).

5. Fill in the missing number: \( ___ + 15 = 60 \).

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Answers:

1. \(15\)

2. \(15\)

3. \(28\)

4. \(7\)

5. \(45\)

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