📚 Topic Summary
Counting back is a simple subtraction strategy where you start with the larger number and count backwards the number of times indicated by the smaller number. The number you land on is the answer! For example, if you have $5 - 2$, you start at 5 and count back 2: 5...4...3. So, $5 - 2 = 3$. This method is great for small numbers and building a strong understanding of subtraction. It's like a mini number line in your head!
🧠 Part A: Vocabulary
| Term |
Definition |
| 1. Subtraction |
A. The answer to a subtraction problem |
| 2. Count Back |
B. Taking away a number from another |
| 3. Difference |
C. To move backwards when counting |
| 4. Number Line |
D. A visual representation of numbers |
| 5. Minus Sign |
E. Symbol (-) indicating subtraction |
Match the term to its definition. (Answers: 1-B, 2-C, 3-A, 4-D, 5-E)
✏️ Part B: Fill in the Blanks
When we count back to subtract, we start with the _______ number. Then, we count _______ the number of times indicated by the number we are _______ . For example, to solve $7 - 3$, we start at _______ and count back _______ times. We get to _______, so $7-3=$ _______.
(Answers: larger, back, subtracting, 7, 3, 6, 5, 4, 4)
🤔 Part C: Critical Thinking
Explain why counting back might be easier for some subtraction problems than others. Give an example of a problem where counting back is a good strategy and a problem where it might not be.
