Subtraction input/output tables – up to three digits
key notes :
Introduction to Input/Output Tables:
- Definition: An input/output table, also known as a function table, is used to show how a set of numbers (inputs) is transformed into another set of numbers (outputs) using a specific operation.
- Purpose: Helps students understand relationships between numbers and practice mathematical operations systematically.
Understanding the Concept:
- Input: The number you start with, often listed in the left column.
- Output: The result after performing a subtraction operation on the input, listed in the right column.
- Rule: The operation that connects the input to the output (e.g., subtracting a specific number).
Example of a Subtraction Input/Output Table:
| Input | Rule | Output |
|---|---|---|
| 345 | – 123 | 222 |
| 562 | – 214 | 348 |
| 789 | – 111 | 678 |
| 903 | – 300 | 603 |
- Explanation: In each row, the rule (subtraction) is applied to the input number to get the output number. For example, in the first row, 345 (input) minus 123 equals 222 (output).
Creating a Subtraction Input/Output Table:
- Step 1: Choose the subtraction rule (e.g., subtract 50).
- Step 2: Select input numbers (up to three digits).
- Step 3: Apply the rule to each input to find the output.
- Step 4: Fill in the table with inputs and corresponding outputs.
Learn with an example
Complete the table .
Rule : subtract 100
Start with the numbers in the “In” column. Subtract 100 from each number.
379 − 100 = 279
542 − 100 = 442
441 − 100 = 341
919 − 100 = 819
Complete the table .
Rule : subtract 100
Start with the numbers in the “In” column. Subtract 100 from each number.
987 − 100 = 887
886 − 100 = 786
768 − 100 = 668
104 − 100 = 4
Complete the table .
Rule : subtract 100
Start with the numbers in the “In” column. Subtract 100 from each number.
846 − 100 = 746
451 − 100 = 351
445 − 100 = 345
773 − 100 = 673
Let’s practice!
