Use written strategies and known facts to calculate the value of a missing part
Lesson details
Learning outcome
I can use written strategies and known facts to calculate the value of a missing part.
Key learning points
- Drawing a model for helps us to solve more complicated problems in a range of contexts.
- Mental strategies can be used to calculate the value of a missing part.
- Written strategies can be used to calculate the value of a missing part.
Keywords
Represent - To represent something means to show something in a different way.
Addend - Addends are any numbers added together.
Common misconception
Pupils draw bar models with larger numbers within them, making them particularly time consuming.
Where larger numbers are used, encourage children to unitise numbers into units of thousands or millions. Equally, if children are secure with what each number represents, they can label each part of the bar with a label from the context itself.
Teacher tip
Where possible and appropriate, encourage children to unitise and use their number facts to solve problems. Pupils may opt for a written method although question whether this is necessary, particularly when dealing with larger numbers which are multiples of thousands or ten thousands for example.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Which equation represents this bar model made of number rods?
Q2.Alex was training for a swimming race. On Monday he swam 1.1 km. On Wednesday he swam 1,250 m and on Friday he swam 1.2 km. How far did he swim? Give your answer in metres. m
Q3.Which equations represent this problem? Jun is making a fruit drink. He has 1.35 l altogether. He has 0.65 l of orange juice and 225 ml of pineapple juice. The rest is water. How much water is needed?
Q4.0.3 + 0.1 + 0.6 = 1 Which other combination of three parts has the same whole?
Q5.Complete the column subtraction to find the difference.
Q6.What digit is missing from this incomplete column addition?
Assessment exit quiz
6 Questions
Q1.Which equations represent the bar model?
Q2.Match the structure to the parts of the bar model.
Q3.Calculate the amount that was spent on leisure time for this holiday, which is shown by the question mark in the bar model. Leisure time = £
Q4.Which equations correctly represent the bar model?
Q5.Calculate the amount of Max Cola sales using the bar models. Max Cola = £ m
Q6.Oak United and Oak Rovers are playing in the Cup Final at Wembley Stadium. How many supporters were cheering for Oak Rovers?
To help you plan your 6 maths lesson on: Use written strategies and known facts to calculate the value of a missing part, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 6 maths lesson on: Use written strategies and known facts to calculate the value of a missing part, 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 Use knowledge of part-part-whole structure to solve additive problems unit, dive into the full primary maths curriculum, or learn more about lesson planning.