The Year 3 Add Two Numbers (across a 100) 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
place value chart: Used to identify the value of the digits that make up a number.
place value counters: A physical resource which represents numbers. They are usually in different colours and have different numbers written on them, to represent ’ones’, ’tens’, ’hundreds’ etc.
exchange: When a digit is taken from one place value column and placed in another.
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.
Varied Fluency
Knowledge Organiser
• Designed to support all children via key information and examples.
Scaffolded Examples
• Using place value counters and sentence stems to add two 3-digit numbers with an exchange.
Support
• Q1: Add two 3-digit numbers with counters, with sentence stems to complete; one exchange.
• Q2: Complete a column addition; the exchanged hundred is given.
• Q3: Find one missing digit in a column addition; the exchanged hundred is given.
Core
• Q1: Add two 3-digit numbers with counters; one exchange.
• Q2: Complete a column addition; no exchanged hundred is given.
• Q3: Find two missing digits in a column addition.
Stretch
• Q1: Add two 3-digit numbers with counters; two exchanges.
• Q2: Make both 3-digit numbers in an empty chart, then complete the column addition; two exchanges.
• Q3: Find two missing digits in a column addition; two exchanges.
Reasoning and Problem Solving
Support
• Q1: Reasoning – judge whether a character has added the exchanged hundred correctly; place value charts provided.
• Q2: Reasoning – decide whether a character has identified a missing digit in a column addition correctly; one exchange.
• Q3: Problem Solving – find two 3-digit numbers with a given total that exchange into the hundreds, with grids showing the total.
Core
• Q1: Reasoning – judge whether a character has added the exchanged hundred correctly.
• Q2: Reasoning – decide whether a character has identified a missing digit in a column addition correctly; two exchanges.
• Q3: Problem Solving – find two 3-digit numbers with a given total that exchange into the hundreds.
Stretch
• Q1: Reasoning – judge whether a character has added the exchanged ten and hundred correctly.
• Q2: Reasoning – decide whether a character has identified the missing digits in a column addition correctly; two exchanges.
• Q3: Problem Solving – find two 3-digit numbers with a given total that need two exchanges and differ by less than 100.
Deeper Reasoning
The questions in this set focus on using the clues to identify the missing digits or different pairs or representations being added together to deepen understanding in adding numbers with up to three digits, using formal written methods of columnar addition.
