One Less Than...

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Aims and objectives
The pupil will understand the term "one less than". They will be able to take one away from a given number between 2 and 10.

Previous knowledge
Pupils can count up to ten and back again in ones. They can add one more to a given number and they are aware of the associated vocabulary. 

In the classroom
The pupil will see a set of randomly placed number cards from to 1 to 10. One number is highlighted. The pupil has to click on the number that is 1 less. Pupils clicking on the correct number are rewarded with a smiley face. Pupils clicking on an incorrect answer are asked to try again. If pupils are having difficulty, a message will tell them to ask the teacher for help. When the pupil finishes the activity, a score appears. The higher the score, the more praise they receive.

This activity, if used with an interactive whiteboard, allows the teacher to pick children to select their answers and talk about their decision to the rest of the class. Other children in the class can provide help and support to their peers.

Support materials description: Resource type:
The first worksheet offers teachers the opportunity to develop pupils' mental agility. As part of a whole-class activity, pupils can cut out the number cards. When the teacher asks, "What is one less than 3?", pupils respond by holding the correct card in the air. More able pupils can make up questions for the rest of the class. One_less_than.pdf
The second worksheet asks pupils to complete number sequences. Each sequence counts back in ones and the sequences increase in difficulty. More able pupils can make up their own sequence. One_less_than_complete.pdf
The final worksheet asks the child to complete number sentences by taking away 1. In this way, the original activity is reinforced and extended. One_less_than_complete_2.pdf

Curriculum references
Foundation Stage – Early Learning Goals:

  • Say and use the number names in order in familiar contexts
  • Count reliably up to 10 everyday objects
  • Recognise numerals 1 to 9
  • Use language such as more or less… to compare two numbers…
  • In practical activities and discussion, begin to use the vocabulary involved in adding or subtracting
  • Find one more or one less than a number from 1 to 10

Key Stage 1 - Numeracy Strategy:

Count on and back in ones from any small number…

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