📚 Quick Study Guide
- ➕ Addition: Combining two or more numbers to find their total.
- ➖ Subtraction: Finding the difference between two numbers.
- 🔄 Inverse Operations: Operations that undo each other. Addition and subtraction are inverse operations.
- 🔢 Checking Addition with Subtraction: If $a + b = c$, then $c - b = a$ and $c - a = b$.
- 📝 Example: If $5 + 3 = 8$, then $8 - 3 = 5$ and $8 - 5 = 3$.
Practice Quiz
- Question 1: What is the inverse operation of addition?
- A. Multiplication
- B. Subtraction
- C. Division
- D. Exponentiation
- Question 2: If $7 + 2 = 9$, which subtraction equation can check this addition?
- A. $2 - 7 = 9$
- B. $9 + 2 = 7$
- C. $9 - 2 = 7$
- D. $7 - 9 = 2$
- Question 3: What number should go in the blank: $12 + 5 = 17$, so $17 - \_\_\_ = 12$?
- A. 17
- B. 12
- C. 5
- D. 0
- Question 4: Which equation shows the inverse operation to check $25 + 15 = 40$?
- A. $25 - 15 = 40$
- B. $40 + 15 = 25$
- C. $40 - 15 = 25$
- D. $15 - 40 = 25$
- Question 5: If a student calculates $36 + 12 = 48$, what is a way to check their work using subtraction?
- A. $36 - 12 = 48$
- B. $48 - 36 = 12$
- C. $48 + 12 = 36$
- D. $12 - 48 = 36$
- Question 6: What is the missing number: $8 + 6 = 14$, so $14 - 8 = $?
- A. 14
- B. 8
- C. 6
- D. 22
- Question 7: Emily added 19 and 11 and got 30. Which subtraction equation could she use to check her work?
- A. $19 - 11 = 30$
- B. $30 - 11 = 19$
- C. $19 + 30 = 11$
- D. $11 - 30 = 19$
Click to see Answers
1: B, 2: C, 3: C, 4: C, 5: B, 6: C, 7: B