Bridge 100 by adding in multiples of 10
Lesson details
Learning outcome
I can use number facts to 20 to add multiples of 10 and bridge 100
Key learning points
- The language of unitising helps us to use number facts to 20 to add multiples of 10 crossing the hundreds.
- Crossing the tens boundary helps us to cross the 100s boundary if we think in tens.
- Partitioning an addend helps us to cross the 100 boundary when adding.
Keywords
Addend - An addend means any of the numbers that are added together.
Bridging 100 - Bridging 100 means partitioning one addend to make a number bond to 100 then adding the remaining part.
Common misconception
Lack of fluency with number facts to 20 can hinder progress in applying them to multiples of ten.
Ensure that fluency with number facts to 20 is secure or supported so that pupils can apply them.
Teacher tip
Rehearse number facts to 20 ahead of this lesson and provide support with these if needed. Make use of base ten manipulatives to help pupils to see the structure especially when bridging through 100.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What is the missing part on the bar model?
Q2.What is the missing whole on the bar model?
Q3.Use this bar model. Which addition calculations are correct?
Q4. 170 = 40 + 100 + . What is the missing part?
Q5.Sofia buys some ribbon that is 170 cm long. She gives 70 cm to her friend. How much does she have left ? cm.
Q6.Which calculations could represent this bar model?
Assessment exit quiz
6 Questions
Q1.What are the addends in this calculation 90 + 30 = 120 ?
Q2.If I know 6 + 5 = 11 what is 6 tens + 5 tens?
Q3.Match the tens to the multiples of ten.
Q4.When adding 80 to 60, how can the addend 60 be partitioned to bridge 100?
Q5.Which addition is equivalent to 80 + 20 + 50?
Q6. A number has been partitioned into something and 40 to bridge 100. What is the missing addend? 70 + + 50 = 150
To help you plan your 3 maths lesson on: Bridge 100 by adding in multiples of 10, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 3 maths lesson on: Bridge 100 by adding in multiples of 10, 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.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 2 maths lessons from the Securing place value to 100 and applying to addition and subtraction unit, dive into the full primary maths curriculum, or learn more about lesson planning.