The Year 2 Fact Families – Addition and Subtraction Bonds within 20 PowerPoint guides both teachers and children through the lesson, including use of the varied fluency, reasoning and problem solving, deeper reasoning and scaffolded resources. Key learning information about this step:
Key Vocabulary
number bonds: Two numbers that join together to make a different whole number.
number sentence: A sentence written using numbers and symbols, such as +, –, x, ÷ and =. For example: 2 + 2 = 4.
fact family: Four number sentences that use the same 3 numbers. They show how addition and subtraction are linked.
part-whole model: A representation that shows the whole number and the parts it has been split into.
Varied Fluency
Knowledge Organiser
• Designed to support all children via key information and examples.
For the purple sections of the four levels, copy and paste these from the first sheet of the varied fluency resource.
Scaffolded Examples
• Counting counters on two ten frames, then writing all four facts in a fact family.
Support
• Q1: complete a fact family within 10 from two ten frames; the first fact is given.
• Q2: complete the bond to 20; the matching bond to 10 and a ten frame are given.
• Q3: write the missing subtraction fact; the whole is given and counters support the part-whole model.
Core
• Q1: complete all four facts in a fact family within 20 from two ten frames.
• Q2: complete a bond to 10 and the matching bond to 20.
• Q3: write the missing subtraction fact from a part-whole model.
Stretch
• Q1: complete a fact family within 20, supplying the whole in each calculation.
• Q2: find the missing part in bonds to 10 and 20, including zero.
• Q3: find the whole, then write all four facts in the fact family.
Reasoning and Problem Solving
Support
• Q1: Reasoning - decide whether a character is correct about a subtraction in a fact family, with ten frames showing the two parts.
• Q2: Reasoning - decide whether all four number sentences in a fact family within 20 are correct, with a part-whole model alongside.
• Q3: Problem Solving - choose three number cards that make a fact family, in two different ways.
Core
• Q1: Reasoning - decide whether a character is correct about a subtraction in a fact family within 20.
• Q2: Reasoning - decide whether all four number sentences in a fact family within 20 are correct.
• Q3: Problem Solving - choose three number cards from six that make a fact family, in three different ways.
Stretch
• Q1: Reasoning - decide whether a character is correct about both subtractions in a fact family, with no addition given.
• Q2: Reasoning - decide whether all four number sentences in a fact family are correct, including facts written with the whole first.
• Q3: Problem Solving - choose three number cards that make a fact family with one condition, in three different ways.
Deeper Reasoning
The question in this set focuses on investigating fact families using given numbers to deepen understanding in representing and using number bonds and related subtraction facts within 20.
