Find the number that is one more than 115 and one less than 117.
We have to find the number that is one more than 115. Let’s use our number line to help. Here’s the number 115. How do we find the number which is one more? Do we count forward or back? We count forward. 115 and one more is 116.
We’re also told that our number is one less than 117. Here’s number 117. To find the number one less, we have to count back. The number which is one more than 115 and one less than 117 is 116.