The Year 3 Subtract Two Numbers (no exchange) 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
formal written method: This is also known as the column method for addition, subtraction and multiplication. For division, this may also be known as the bus stop method.
place value chart: Used to identify the value of the digits that make up a number.
exchange: When a digit is taken from one place value column and placed in another.
placeholder: 0 is used to hold a place in a number and maintain its place value.
Varied Fluency
Knowledge Organiser
• Designed to support all children via key information and examples.
Scaffolded Examples
• Subtracting two numbers with counters or Base 10 and the column method; completing one column at a time.
Support
• Q1: Subtract two 2-digit numbers using counters; working out shown on place value chart.
• Q2: Use Base 10 to complete a 3-digit subtraction; column method grid set up.
• Q3: Complete a word problem; bar model provided alongside place value counters.
Core
• Q1: Subtract two 2-digit numbers using counters.
• Q2: Use Base 10 to complete a 3-digit subtraction; blank column method grid.
• Q3: Complete a word problem; bar model provided.
Stretch
• Q1: Subtract two 2-digit numbers using counters; blank column method grid.
• Q2: Complete a 3-digit subtraction; blank column method grid.
• Q3: Complete a word problem.
Reasoning and Problem Solving
Support
• Q1: Reasoning - judge whether a character has crossed out the correct Base 10 pieces; representation provided.
• Q2: Reasoning – judge whether a subtraction has been completed correctly; column method and place value chart provided.
• Q3: Problem Solving – find the missing digits in one column of a subtraction with a given 3-digit answer and no exchange.
Core
• Q1: Reasoning - judge whether a character’s statement about crossing out place value counters is correct.
• Q2: Reasoning - judge whether a subtraction has been completed correctly; column method provided.
• Q3: Problem Solving - find the missing digits in two columns of a subtraction with a given 3-digit answer and no exchange.
Stretch
• Q1: Reasoning - judge whether a character’s statement about crossing out place value counters where a column contains zero is correct.
• Q2: Reasoning - judge whether a subtraction has been completed correctly.
• Q3: Problem Solving - find the missing digits in three columns of a subtraction with a given 3-digit answer and no exchange.
Deeper Reasoning
The questions in this set focus on finding a path through a maze and using the clues to identify the subtraction to deepen understanding in subtracting numbers with up to three digits, using formal written methods of columnar subtraction
