Operations with natural numbers - I

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INTEF

In this unit, basic concepts of natural numbers are revised and the operations of addition and subtraction are practised. Numbers that appear in each window are generated at random. This allows you to use the window indefinitely and practise a lot of different exercises. Numbers consist of only one or two figures so the calculations can easily be done mentally. Magic squares are used in the exercises, however the main objective of this unit is to learn things about natural numbers.

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This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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publisher INTEF 07/12/2025 publisher INTEF . 07/12/2025 publisher INTEF 07/12/2025 author In this unit, basic concepts of natural numbers are revised and the operations of addition and subtraction are practised. 07/12/2025 publisher Instituto de Tecnologías Educativas (ITE) 07/12/2025 editor Instituto de Tecnologías Educativas (ITE) 07/12/2025 technical validator Mª Ana López Montes 07/12/2025 technical validator Ángel Cabezudo Bueno 07/12/2025