📚 Topic Summary
Checking subtraction with addition is a way to make sure you got the subtraction problem right! It's like a secret code. When you subtract, you take away a number. Then, to check, you add the answer you got (the difference) back to the number you subtracted (the subtrahend). If it equals the number you started with (the minuend), you did it right! For example, if $5 - 2 = 3$, then $3 + 2$ should equal $5$.
Think of it like having 5 cookies 🍪. You eat 2. You have 3 left. To check, you put the 3 cookies you have left and the 2 you ate back together. Do you have 5 again? If yes, your subtraction was correct!
🧮 Part A: Vocabulary
Match the word to its definition:
| Word |
Definition |
| 1. Minuend |
a. The answer you get after subtracting. |
| 2. Subtrahend |
b. The number you are subtracting. |
| 3. Difference |
c. The number from which you subtract. |
| 4. Addition |
d. Putting numbers together to find the total. |
| 5. Check |
e. To make sure something is correct or accurate. |
(Answers: 1-c, 2-b, 3-a, 4-d, 5-e)
✏️ Part B: Fill in the Blanks
Use the following words to complete the paragraph: addition, difference, minuend, subtrahend, check.
To _______ subtraction, you can use _______. You add the _______ to the _______. If the result equals the _______, your subtraction is correct!
(Answers: check, addition, difference, subtrahend, minuend)
🤔 Part C: Critical Thinking
Explain in your own words why addition can be used to check if a subtraction problem is correct. Give an example.