Number Fact Families - PowerPoint

Year 1 students are introduced to the concept of number fact families, a fundamental part of learning addition and subtraction. The lesson begins by exploring addition facts, using simple equations such as 4 + 3 = 7 and 3 + 4 = 7 to illustrate that, although the order of the numbers changes, the sum remains the same. This characteristic demonstrates the commutative property of addition, which is a key concept in understanding how numbers relate to each other within a 'family'. The lesson encourages students to observe the similarities and differences between these addition facts, highlighting that they consist of the same numbers but are arranged differently.

Building on this, the lesson then introduces subtraction facts to complete the number fact family. For example, alongside the addition facts 4 + 3 = 7 and 3 + 4 = 7, the related subtraction facts are 7 - 3 = 4 and 7 - 4 = 3. Students learn that each number fact family is made up of two addition facts and two subtraction facts, with the largest number coming first in subtraction. Several exercises guide students through forming these fact families using visual aids like train carriages, reinforcing the concept that knowing one fact can help deduce the others. The lesson aims to provide a clear understanding of how number fact families work, equipping students with a strategy to solve basic addition and subtraction problems effectively.