Counting back to subtract is a simple way to find the difference between two numbers. Instead of using your fingers for a long time, you start with the bigger number and count backwards the number of times shown by the smaller number. The number you land on is the answer! For example, if you have $5 - 2$, start at 5 and count back two numbers: 4, 3. So, $5 - 2 = 3$. It's like a mini-countdown to the answer!
This method works best when you're subtracting small numbers. It’s a quick way to solve problems in your head, and it helps you understand what subtraction really means: taking away!
Match each word with its correct meaning:
| Word | Meaning |
|---|---|
| 1. Subtract | A. The answer to a subtraction problem |
| 2. Difference | B. To take away a number from another |
| 3. Count Back | C. The number you subtract |
| 4. Minuend | D. To count backwards from a number |
| 5. Subtrahend | E. The number you start with when subtracting |
Write the correct letter (A, B, C, D, or E) next to each number.
Use the words from the box to fill in the blanks.
Words: smaller, counting, bigger, difference, subtract
When we subtract, we are finding the _________ between two numbers. We can use _________ back to _________. Start with the _________ number and count back the _________ number of times.
Sarah has 8 apples and gives 3 to her friend. Explain how she can use counting back to find out how many apples she has left.
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