The Year 3 Add 1s Across a 10 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
exchange: When a digit is taken from one place value column and placed in another.
multiple: A product of one number multiplied by another number. For example: multiples of 10 are the products of numbers multiplied by 10.
partitioning: The splitting of a number into different parts. For example: the number 547 can be partitioned into 500, 40 and 7.
number lines: A horizontal or vertical line which has numbers placed at equal points. Number lines can be used to show either positive or negative numbers. Most number lines begin at 0.
Varied Fluency
Knowledge Organiser
• Designed to support all children via key information and examples.
Scaffolded Examples
• Adding ones with sentence stems and a number line; adding ones with sentence stems and a part-whole model; adding ones by completing given calculations.
Support
• Q1: Add across a 10 on a number line, with the next multiple of 10 given.
• Q2: Add using a part-whole model with the whole already shown.
• Q3: Add two calculations; same starting number; tick any that need an exchange.
Core
• Q1: Add across a 10 on a number line, including a zero in the tens.
• Q2: Add using a part-whole model to partition the ones, including a 0 in the tens.
• Q3: Add two calculations; different starting numbers; tick any that need an exchange.
Stretch
• Q1: Add across a 10 on a blank number line, labelling it and marking both jumps.
• Q2: Add using a part-whole model; the next multiple of 10 is not prompted for.
• Q3: Add two calculations; different starting numbers and a 0 in the tens; tick any that need an exchange.
Reasoning and Problem Solving
Support
• Q1: Reasoning - spotting the error in a partition, with the jump to the next multiple of 10 given.
• Q2: Reasoning – choosing the part-whole model that reaches the next multiple of 10, with that multiple given.
• Q3: Problem Solving - completing a table of additions that cross a 10, with the numbers given.
Core
• Q1: Reasoning - spotting the error in a partition of the ones.
• Q2: Reasoning - choosing the part-whole model that reaches the next multiple of 10.
• Q3: Problem Solving - completing a table of additions that cross a 10, choosing some of the numbers.
Stretch
• Q1: Reasoning – explaining what is wrong in a correct total reached by a faulty method.
• Q2: Reasoning - choosing the part-whole model that reaches the next multiple of 10 and write the two steps.
• Q3: Problem Solving - completing a table of additions working backwards from given totals.
Deeper Reasoning
The questions in this set focus on problem solving with number cards to create addition number sentences involving one exchange to deepen understanding in adding and subtracting numbers mentally, including 3-digit numbers and ones.
