Addition and subtraction - Related facts - Worksheet

The "Related Facts" worksheet is a resource designed to help Year 6 students enhance their fluency in addition and subtraction by using related facts. The National Curriculum objective targeted by this lesson is for students to recall and use addition and subtraction facts to 20 fluently, and to derive and use related facts up to 100. The materials provided for the lesson include differentiated worksheets and teaching slides, which support the learning process. Key vocabulary such as "related facts," "similar," "digits," "tens," and "ones" is introduced to help students recognise patterns in numbers and calculations. For instance, if a child understands that 3 plus 2 equals 5, they should be able to apply this to similar digits in tens, such as 30 plus 20 equals 50.

The worksheets guide children through various exercises that reinforce the concept of related facts. One activity involves completing sentences that demonstrate the relationship between simple addition facts and their corresponding tens, such as "I have 4 red marbles and 2 green marbles. Together, I have 6 marbles. I have 40 red marbles and 20 green marbles. Together, I have _____ marbles." Students are prompted to fill in the blanks and to notice the similarities and differences between the calculations. This practice helps them to understand the concept of scaling up by a factor of ten. The worksheets also include reasoning and problem-solving tasks, where students must find missing numbers and explain the relationships they observe, further deepening their understanding of related facts in different contexts.