The Year 2 Subtract Across 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
subtraction: Take one amount from another.
ten frame: A representation to help us count and make groups of 10.
partition: When we partition, we split a number into smaller numbers.
The larger number is the whole and the smaller numbers are the parts. Numbers can be partitioned in different ways, for example into tens and ones.
number bonds: Two numbers that join together to make a different whole number.
Varied Fluency
Knowledge Organiser
• Designed to support all children via key information and examples.
Scaffolded Examples
• Counting the counters in ten frames, crossing out ones to get back to 10, partitioning the number taken away and showing the jumps on a number line.
Support
• Q1: Use ten frames to subtract across 10; the ones are already crossed out.
• Q2: Use a part-whole model and number line; the whole and one part are given; the starting number is labelled on the number line.
• Q3: Use bonds to 10 to subtract; both subtraction steps are given.
Core
• Q1: Use ten frames to subtract across 10; each step is set up.
• Q2: Use a part-whole model and number line; the whole is given.
• Q3: Use bonds to 10 to subtract; partition the number being subtracted, then complete both subtraction steps.
Stretch
• Q1: Use ten frames to subtract across 10; find all missing numbers.
• Q2: Use a blank part-whole model; only end points are labelled.
• Q3: Use bonds to 10; find the missing number being subtracted and complete the two steps through 10.
Reasoning and Problem Solving
Support
• Q1: Reasoning – decide whether a character has subtracted across 10 correctly; completed ten frames given.
• Q2: Reasoning – decide whether ten frames and a fully labelled number line show the same subtraction.
• Q3: Problem Solving – complete subtractions across 10 using a given answer; tens digit and labelled number line.
Core
• Q1: Reasoning – decide whether a character has subtracted across 10 correctly; filled ten frames given.
• Q2: Reasoning – decide whether ten frames and a number line show the same subtraction; the jumps are labelled.
• Q3: Problem Solving – complete subtractions across 10 using a given answer; tens digit and partially labelled number line.
Stretch
• Q1: Reasoning – decide whether a character has partitioned the number taken away correctly; empty ten frames given.
• Q2: Reasoning – decide whether ten frames and a number line show the same subtraction; work out the jumps.
• Q3: Problem Solving – complete subtractions across 10 using a given answer and tens digit; without a number line.
Deeper Reasoning
The questions in this set focus on problem solving with money totals to deepen understanding in adding and subtracting numbers using concrete objects and pictorial representations, including: a two-digit number and ones; a two-digit number and tens and two two-digit numbers.
