One more than 7
Start at 7 and move forward one step to 8.
One more than 7 is 8
Year 1
Find one more and one less than a given number
Move one step forwards or one step backwards from a number and say what changes.
Lesson overview
Number - number and place value
One more means the number gets bigger by 1. One less means the number gets smaller by 1. We can use a number line or counted objects to see the step clearly.
One less than 12
Start at 12 and move back one step to 11.
One less than 12 is 11
One more than 19
The next number after 19 is 20.
One more than 19 is 20
Worked example
Find one less than 15.
- Start at 15.
- One less means move back by 1.
- The number before 15 is 14.
- So one less than 15 is 14.
One less than 15 is 14
Try it
Read the number, then move forward or backward by 1.
Question 1
What is one more than 9?
Question 2
What is one less than 18?
Question 3
Which answer is one more than 24?
Question 4
What is one less than 30?
Question 5
What do you do to find one less?
Common mistakes
These reminders help when finding one more and one less.
- Moving forward when the question asks for one less.
- Moving back when the question asks for one more.
- Jumping by more than 1 instead of taking one single step.
Related topics
These connect closely to one more and one less.
- Count to and across 100 forwards and backwards, beginning with 0, 1 or any given number.
- Count in multiples of 2, 5 and 10.