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This activity is about finding the missing number in adding sums.
Example
Find the value of the missing number.
| 35 | + | = | 49 |
Answer
We need to find the difference between the numbers 35 and 49.
We can start at 35 and count on to get to 49. This would be 14 numbers: 35 + 14 = 49
The answer is 14
We could also start at 49 and count back to 35. This would also be 14 numbers: 49 - 35 = 14
Both methods are correct and give us the same answer of 14. Which method works best for you?
