Write the addition or subtraction rule for an input/output table – up to 20
Learn with an example
✈️ This input/output table shows addition.
Find the rule and type the correct number in the blank.
| In | Out |
| 1 | 11 |
| 7 | 17 |
| 9 | 19 |
✈️ Rule: + ____
- Start with the number in the In column. Figure out what number, when added to it, gives the value shown in the Out column.
- 1 + 10 = 11
7 + 10 = 17
9 + 10 = 19 - This is the rule: + 10.
✈️ This input/output table shows subtraction.
Find the rule and type the correct number in the blank.
| In | Out |
| 17 | 1 |
| 19 | 3 |
| 20 | 4 |
✈️ Rule: − ____
- Start with the number in the In column. Figure out what number, when subtracted from it, gives the value shown in the Out column.
- 17 −16 = 1
19 −16 = 3
20 −16 = 4 - This is the rule: − 16.
✈️ This input/output table shows addition.
Find the rule and type the correct number in the blank.
| In | Out |
| 0 | 14 |
| 2 | 16 |
| 6 | 20 |
✈️ Rule: + ____
- Start with the number in the In column. Figure out what number, when added to it, gives the value shown in the Out column.
- 0 + 14 = 14
2 + 14 = 16
6 + 14 = 20 - This is the rule: + 14.
Let’s practice!🖊️
