Show one more and one less than a number using representations and describe this accurately
I can recognise that the number before a given number is one less and the number after a given number is one more.
Show one more and one less than a number using representations and describe this accurately
I can recognise that the number before a given number is one less and the number after a given number is one more.
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Lesson details
Key learning points
- Movement is magnitude. As you move forwards through the counting sequence the quantity increases by one.
- Movement is magnitude. As you move backwards through the counting sequence the quantity decreases by one.
- Use a number line to model the counting sequence and include zero.
Keywords
One more - The number after a given number is one more than it.
One less - The number before a given number is one less than it.
Before - A number that is before another comes earlier in our count.
After - A number that is after another comes later in our count.
Number line - A line with numbers placed in their correct position.
Common misconception
Children may confuse one more and one less, particularly when finding missing numbers.
Use the stem sentence __ is one more / less than __ because it comes after / before it in the count.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What is missing in the count? 1, 2, 3, _, 5
Q2.What number is missing when counting back from 5? 5, 4, _, 2, 1
Q3.The number before my number is one ___ than my number.
Q4.The number after my number is one ___ than my number.
Q5.What is one more than 3?
Q6.What is one less than 3?
Assessment exit quiz
6 Questions
Q1.Izzy thinks the missing number will be the same for both of these. Is she correct?
Q2.Jacob thinks the missing number will be the same for both of these. Is he correct?
Q3.Jacob has 4 conkers in his pocket. He finds one more. How many conkers does he have now?
Q4.Izzy has 3 pounds in her piggy bank. She is given one more pound. How many does she have now?
Q5.Jacob has 4 conkers in his pocket. He gives one to Izzy. How many conkers does he have left in his pocket?
Q6.Izzy has 5 pounds in her piggy bank. She takes one pound out to spend. How many does she have left?
