The Year 2 Subtract Two 2-Digit Numbers (Not 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
ones: Individual units that make up a whole number.
tens: A group of 10 ones together is the same as 1 ten.
subtract: Take one quantity away from another.
finding the difference: Find how far apart two given numbers are.
Varied Fluency
Knowledge Organiser
• Designed to support all children via key information and examples.
Scaffolded Examples
• Guided practice counting tens and ones in Base 10; subtracting the ones first, then the tens.
Support
• Q1: Subtract using Base 10; the ones and tens to subtract are given.
• Q2: Find the difference with a bar model; the ones and tens are given.
• Q3: Write the subtraction shown by Base 10; the starting number is given.
Core
• Q1: Subtract using Base 10; complete the ones, tens and answer.
• Q2: Find the difference with a bar model; complete the ones and tens.
• Q3: Write the subtraction shown by Base 10; no numbers are given.
Stretch
• Q1: Subtract from the number in Base 10; the start number is not written.
• Q2: Find a missing number from its difference to a given number.
• Q3: Write the subtraction shown by the Base 10. Then use the same numbers to write a different subtraction.
Reasoning and Problem Solving
Support
• Q1: Reasoning – explain whether a character has subtracted correctly; each step is given in the speech bubble.
• Q2: Reasoning – check whether a subtraction matches clues about tens and ones; a reminder is given.
• Q3: Problem Solving – choose two number cards to make a subtraction that does not cross a 10; a tip is given.
Core
• Q1: Reasoning – explain whether a character has subtracted two 2-digit numbers correctly.
• Q2: Reasoning – check whether a subtraction matches clues about tens and ones.
• Q3: Problem Solving – choose two number cards to make a subtraction that does not cross a 10.
Stretch
• Q1: Reasoning – explain whether a subtraction with 0 ones or a missing part is correct.
• Q2: Reasoning – check whether a subtraction matches clues that compare digits.
• Q3: Problem Solving – choose two number cards to make a subtraction with an odd or even answer that does not cross a 10.
Deeper Reasoning
The question in this set focuses on problem solving about books at a book fair to deepen understanding of addition and subtraction of 2-digit numbers using concrete objects and pictorial representations.
