Teaching strategy- It is a method adopted by a teacher to assist the children throughout the learning process. Key PointsEstimation refers to finding something very close to the correct answer. It is also known as an approximation. Estimation is a higher-level skill that needs children to think about and manipulate numbers mentally. Estimation activities are a great way to practice problem-solving. It helps children to reason abstractly and quantitatively. Students who lack estimation abilities are unable to assess whether their answer falls within the realistic range. Estimating the quantity of water used by families per day will help children to know how much water is being wasted in their community. Hence, we conclude that the most appropriate strategy for this purpose is an estimation of the quantity of water used by a family per day. Additional Information A field trip or excursion is a visit to a location outside the classroom where students can try new things, have new experiences, and obtain first-hand observation. A documentary is a nonfictional film that aims to capture reality, primarily for instruction, education, or preservation of historical records.