The number after a given number is one more than it.

The number before a given number is one less than it.

A number that is before another comes earlier in our count.

A number that is after another comes later in our count.

Show one more and one less than a number using representations

Maths

Explain that numbers can represent how many objects there are in a set

Ordinal numbers show the position of an object in relation to another

Partition numbers one to five in different ways

Partition the numbers one to five in a systematic way

Find a missing part when one part and the whole is known

Solve problems finding a missing part when one part and the whole is known

Show one more and one less than a number using representations and describe this accurately

Use a bar model to represent a whole partitioned into two parts

Solve problems using a bar model to represent a whole partitioned into two parts

In this unit pupils will revisit how numbers are represented cardinally and ordinally. They will partition 1 - 5 in different ways and find a missing part. In the future unit pupils will represent numbers 6 - 10 by partitioning in different ways. They will learn what odd and even numbers are and how they can be partitioned. They will identify a missing part when a whole is partitioned into 2 parts

In prior learning, pupils will have explored the composition of numbers to 10 and be able to subitise up to 5. In this unit pupils will partition 1 to 5 in different ways and find a missing part.

In this unit pupils will revisit how numbers are represented cardinally and ordinally. They will partition 1 - 5 in different ways, find a missing part when one part and the whole are known and explore one more and one less with numbers to five.

Composition of numbers 0 to 5

Which part-part-whole model is showing Laura’s cubes correctly partitioned?

Which part-part-whole model is showing Andeep’s cubes correctly partitioned?

One more than 3 is 4, so one less than 4 is _

One less than 5 is 4, so one more than 4 is _

Laura thinks the missing number will be the same for both of these. Is she correct?

Andeep thinks the missing number will be the same for both of these. Is he correct?

What is the next number in the count when counting forwards from 2?   2, 3, _

What is the next number when counting back from 5?   5, 4, _

Show one more and one less than a number using representations

Lesson outcome