The next number in the count is one more than the number before and there will be one more object in the set.

The previous number in the count is one less than the next number and there will be one fewer object in the set.

Finding one more and one less with manipulatives and images

Maths

Counting to and from 20

Counting on

Counting back from 20

Counting forward to 20 and back from 20

Comparing numbers to 20

Ordering numbers 11- 20 practically

Comparing and ordering numbers 0-20 practically

Finding one more and one less using representations

Finding the missing number from 0 to 20

In this unit pupils will consolidate counting to 20 and back. They will secure their understanding of the teens numbers in a cardinal and an ordinal context. In the future unit pupils will extend their counting to counting the decade numbers and making representations using a variety of different manipulatives.

In prior learning, pupils will have learnt to count confidently and have developed a deep understanding of the numbers to 10, the relationships between them and the patterns within those numbers. In this unit pupils will consolidate counting to 20 and back and will secure their understanding of the teens numbers in a cardinal and an ordinal context.

In this unit pupils will consolidate counting to 20 and back They will secure their understanding of the teens numbers in a cardinal and an ordinal context.

Which picture shows one more than the number of chicks?

Which picture shows one less than the number of pens?

When you count to 20, which number do you say before 15?

When you count back from 20 to zero, what number comes before 15?

Count up from 1 in a whispering voice and stop at 17. What number will you say next?

Count back from 20 in a loud voice and stop at 13. What number will you say next?

Finding one more and one less with manipulatives and images

Lesson outcome