This notebook is useful for every student, at school or at home. Each number is presented in various ways, based on children's experience: with fingers, dice, abacus, coins, etc. After the child understands the concept of each number, they proceed to correctly write the digits in an organized space. Following are exercises aimed at practicing number analysis and creating sums or differences within the tens. In this way, the child acquires the foundations to later transition more easily to calculations with larger numbers.