Add by bridging a multiple of ten
Lesson details
Learning outcome
I can bridge ten to add single digit numbers to two-digit numbers.
Key learning points
- When adding a single digit and a two-digit number, the equation can be solved more efficiently by 'bridging ten.'
- When bridging a multiple of ten, the second addend is partitioned so that it reaches the next multiple of ten.
- Bridging ten is an efficient strategy because number pairs to ten can be used to calculate more easily.
Keywords
Bridge - A mental strategy which uses addition or subtraction to cross a number boundary.
Partition - The act of splitting an object or value down into smaller parts.
Common misconception
Children may partition the second addend in a way that does not allow them to make use of the multiple of ten and use their number bonds to calculate efficiently.
Use ten frames and number lines to support children in finding the multiple of ten and partition the addend in different ways to compare the efficiency of different ways of partitioning.
Teacher tip
Encourage children to draw their own number lines to support the development of mental methods and dsiplay and use stem sentences that support with the articualtion of thinking.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Alex represents the equation 32 + 8 = ___ Which known fact could he use to solve it more efficiently?
Q2.Use the picture to complete the stem sentence. We know that 7 plus 3 is equal to 10, so we also know that plus 3 is equal to 30
Q3.Which of the following numbers will complete the equation? 65 + 5 = ___
Q4.Which equation would be next in this pattern? 10 − 8 = 2, 20 − 8 = 12, 30 − 8 = 22 ...
Q5.What is the missing addend in the next equation? Remember, you can partition the two-digit number to help you see the ones more clearly. 52 + 8 = 60, 53 + 7 = 60, 54 + = 60 ...
Q6.I know that 10 − 1 = 9, so I also know that 30 − 1 =
Assessment exit quiz
6 Questions
Q1.Which representation shows that the ‘bridge 10’ strategy has been used to solve 7 + 5 = 12?
Q2.How would 6 be partitioned to ‘bridge 10’ in this equation? 8 + 6 = 14
Q3.How can we solve this equation? 16 + 7 = ___
Q4.55 + 7 =
Q5.Look at the number line. What is the missing multiple of 10?
Q6.What is the missing addend on this number line?
To help you plan your 2 maths lesson on: Add by bridging a multiple of ten, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 2 maths lesson on: Add by bridging a multiple of ten, 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 1 maths lessons from the Adding and subtracting ones and tens to and from 2-digit numbers unit, dive into the full primary maths curriculum, or learn more about lesson planning.