The Year 3 Subtract a 2-Digit Number from a 3-Digit Number 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 a 2-digit number from a 3-digit number using counters, the column method and sentence stems.
Support
• Q1: Use place value counters to complete a subtraction; the exchange is given.
• Q2: Complete two column subtractions; the exchange is given.
• Q3: Solve a word problem with no tens; the calculation is set up in the grid; the exchange is given.
Core
• Q1: Use place value counters to complete a subtraction with one exchange.
• Q2: Complete two column subtractions; one exchange.
• Q3: Solve a word problem with no tens; a blank grid is given.
Stretch
• Q1: Use place value counters to complete a subtraction with two exchanges.
• Q2: Place the digits in the grids and complete two column subtractions; two exchanges.
• Q3: Solve a two-step word problem; two blank grids are given.
Reasoning and Problem Solving
Support
• Q1: Reasoning – explain whether a character has subtracted correctly; one exchange; subtraction shown using column method and place value counters.
• Q2: Reasoning – decide whether a character has written the digits in the correct place value columns; no exchange.
• Q3: Problem Solving – find three 2-digit numbers that give an answer greater than a given number.
Core
• Q1: Reasoning – explain whether a character has subtracted correctly; two-part exchange; subtraction shown using column method.
• Q2: Reasoning – decide whether a character has written the digits in the correct place value columns; one exchange.
• Q3: Problem Solving – find three 2-digit numbers that give an answer greater than a given number; one exchange needed.
Stretch
• Q1: Reasoning – explain whether a character has subtracted correctly; two-part exchange.
• Q2: Reasoning – decide whether a character has written the digits in the correct place value columns; two exchanges.
• Q3: Problem Solving – find three 2-digit numbers that give an answer inside a given range; placeholder in tens.
Deeper Reasoning
The questions in this set focus on investigating how much change there will be from buying different toys at a toy shop and how much of a show was interrupted by people talking and popcorn rustling to deepen understanding in subtracting numbers with up to three digits, using formal written methods of columnar subtraction.
