What Are Subtraction Input/Output Tables?
Subtraction tables help us see patterns when we take numbers away!
These special tables show us what happens to numbers when we subtract the same amount each time. It's like a number machine where you put numbers in one side (input), subtract something, and get new numbers out the other side (output)!
How to Read Subtraction Tables
1️⃣ Look at the Input - These are the starting numbers
2️⃣ Find the Rule - What number are we subtracting each time?
3️⃣ Check the Output - These are the answers after subtracting
Let's Practice Together!
Example 1: The Cookie Jar
Every day, Mrs. Baker takes 25 cookies out of her jar to share with her class. Can you help complete the table?
| Day | Cookies in Jar (Input) | Cookies Taken | Cookies Left (Output) |
|---|---|---|---|
| Monday | 200 | 25 | |
| Tuesday | 175 | 25 | |
| Wednesday | 150 | 25 |
Example 2: The Balloon Pop Game
At the carnival, the balloon pop game starts with balloons and some pop each round. Can you find how many are left?
| Round | Balloons at Start (Input) | Balloons Popped | Balloons Left (Output) |
|---|---|---|---|
| 1 | 350 | 50 | |
| 2 | 300 | 50 | |
| 3 | 250 | 50 |
Parent Tips 🌟
- Make it real: Use items like cereal pieces or coins to create physical input/output tables on your table. Kids love moving objects to see the subtraction happen!
- Daily practice: Look for subtraction patterns in everyday life - countdown timers, decreasing temperatures, or pages left in a book.
- Celebrate mistakes: When answers are wrong, celebrate the opportunity to learn! Say "Great try! Let's see how we get to the answer together."