- Year 6
Add and subtract mentally without bridging a boundary
I can add and subtract mentally without bridging a boundary with one or more digits changing
- Year 6
Add and subtract mentally without bridging a boundary
I can add and subtract mentally without bridging a boundary with one or more digits changing
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Lesson details
Key learning points
- Known facts to 10 can be applied when adding and subtracting 100s, 1,000s, 10,000s and 100,000s
- When adding and subtracting mentally, the language of unitising supports us in addition to using known facts.
- An understanding of the structure of numbers and place value supports when we add and subtract mentally.
Keywords
Addend - An addend is a number added to another. They are also known as the parts.
Common misconception
Children may believe that only one digit will change when adding two numbers where one addend has only one non-zero digit.
This is usually correct but what would happen if the digit changed to a value of 10 or greater? Then we would need to regroup (another lesson).
To help you plan your year 6 maths lesson on: Add and subtract mentally without bridging a boundary, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 6 maths lesson on: Add and subtract mentally without bridging a boundary, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 2 maths lessons from the Order, compare and calculate with numbers up to 8 digits unit, dive into the full primary maths curriculum, or learn more about lesson planning.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Complete: is 3,000 more than 6,000
Q2.1,306 + 400 =
Q3.Two plus three is equal to five so two thousand plus three thousand is equal to ___
Q4. is forty thousand less than ninety thousand. Give your answer as a numeral using digits.
Q5.6,709 − 3,000 = ___
Q6.Lucas thinks of a number. His number is 5,100 more than 13,215 What is his number?
Assessment exit quiz
6 Questions
Q1.3,901,481 + 3,000 = ___
Q2.Complete: 8,940,305 − 300,000 =
Q3.Match the addends to their sum.
6,451,038
4,651,038
4,471,038
4,453,038
4,451,238
Q4.7,154,302 + 500,000 − 400,000 =
Q5.Match the equations to their difference.
8,265,792
8,265,292
8,265,272
8,265,268