"The Numbers We Know" is a practical activity lesson that is an expanding activity that enables students to deepen their understanding of numbers after learning numbers within 100. Before this lesson, students knew numbers within 100 and had often been exposed to numbers within 100 in real life. Therefore, students have practical experience in using numbers to express and communicate. Although students already have some foundation in numbers, they do not have much feeling and experience about how to estimate the number of other items by using one item as a reference, so they need to accumulate experience through extension activities. In addition, students have a vague understanding that the same number can express many different things and has different meanings in different contexts. Teachers must arrange a series of mathematical activities from shallow to deep to help students accumulate activity experience and guide them to improve their number sense in conjecture and reflection gradually.

Miaoli Lai. Enhancing Number Sense in Practice and Application—Take the Teaching Record of "The Numbers We Know" as an Example. International Journal of New Developments in Education (2025), Vol. 7, Issue 1: 197-203. https://doi.org/10.25236/IJNDE.2025.070130.

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