Solve problems involving the addition of two-digit numbers
Lesson details
Learning outcome
I can solve problems involving addition of two-digit numbers.
Key learning points
- Partitioning the addends can help us to solve problems involving two-digit numbers.
- Once we have written the equation, we must think carefully about the most efficient strategy to use.
- It is important to be able to calculate mentally before adding two 2-digit numbers.
Keywords
Partition - To split a whole up into parts.
Efficient - Not wasting time or effort. An efficient strategy is one we can carry out easily.
Common misconception
When the amount of processing required for a task increases, children often default to inefficient strategies such as counting in ones if the use of efficient strategies are not yet automatic.
When solving problems, continue to focus upon, and discuss, the most efficient strategies to use to ensure that this thinking becomes automatic.
Teacher tip
Encourage children to 'think out loud' when solving problems and model this. Represent problems visually so the structure of them is fully understood, then focus on the numbers involved and how these can be used efficiently.
Licence
Lesson video
Loading...
Prior knowledge starter quiz
6 Questions
Q1.Solve the equation in the most efficient way. 48 + 34 =
Q2.Which of the following is correct?
Q3.Find the missing whole in the bar model. The missing whole is
Q4.Which equation is represented by this number line?
Q5.Which of the following is the missing addend? + 36 = 51
Q6.Find the missing addend. 47+ = 73
Assessment exit quiz
6 Questions
Q1.Solve the addition problem. Izzy has 34 beads on her bracelet and she adds 42 more. Use the strategy you find most efficient to solve the problem.
Q2.Which strategy is the most efficient when solving this problem? There are 38 cows in the field and 57 in the barn. How many cows are there altogether?
Q3.Which of the following is the most efficient way to solve this problem? There were 68 children in the hall, then 23 more children went in. How many children are in the hall now?
Q4.Izzy sees 42 birds and Andeep sees 76 birds. How many more birds does Andeep see?
How many tens will be in the missing addend when the equation is written for this problem?
Q5.Izzy had 46 seeds in her packet and Andeep had 72 seeds in his packet. How many more seeds did Andeep have than Izzy?
Q6.Andeep counts 59 minibeasts and Izzy counts 83 minibeasts. How many more minibeasts does Andeep count?
To help you plan your 2 maths lesson on: Solve problems involving the addition of two-digit numbers, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 2 maths lesson on: Solve problems involving the addition of two-digit numbers, 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 Addition and subtraction of two 2-digit numbers unit, dive into the full primary maths curriculum, or learn more about lesson planning.