Represent addition and subtraction of tens and ones with equations
Lesson details
Learning outcome
I can represent the combining and partitioning of tens and ones with addition and subtraction equations.
Key learning points
- When tens and ones are combined to make a two-digit number, this can be represented it as an addition equation.
- When a two-digit number is partitioned into tens and ones, this can be represented as a subtraction equation.
Keywords
Partition - To split a whole up into parts.
Combine - To put parts together to make a whole.
Part - A piece or section of a whole.
Whole - All of something; complete.
Common misconception
Children may fail to appreciate the importance of the equals sign in an equation, e.g. making errors such as 16 = 4 + 20, or confuse the value of the digits, making errors such as 43 = 4 + 30
Use the language of parts and whole to activate/link to prior learning. Encourage drawing of own part-part-whole models. Encourage children to spot errors and explain why they are are incorrect and to articulate their thinking around correct answers.
Teacher tip
As previously, if children are making place value errors, return to practical equipment and the use of a number line. When representing numbers without practical equipment, ask children to prove with equipment or explain to a friend.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Match each number to the number that has an equal value.
49
76
5 tens 8
8 tens 5
Q2.Which bar model shows 47 partitioned correctly?
Q3.Lucas has some 10 p and some 1 p coins in his pocket. Altogether, he has 52 p in his pocket. How many of each coin does he have?
Q4.What is the missing part in the part-part-whole model?
Q5.69 has been partitioned into tens and ones. What is the missing number?
69 can be partitioned into ___ and 9
Q6.Izzy wants to buy the ball. She already has two 1 p coins. Which of the following shows how much more money she will need to buy the ball?
Assessment exit quiz
6 Questions
Q1.Which of the following equations are represented in this part-part-whole model?
Q2.Which part-part-whole model represents 50 + 6 = ?
Q3.What is the missing number in the sentence? There are ___ tens, which is 30, and 9 ones, which is 9 There is 39 altogether.
Q4.Which of the following completes the equation correctly.
Q5.Match the equation to the correct missing number.
3
35
53
Q6.Use > , < or = to complete the equation.
To help you plan your 2 maths lesson on: Represent addition and subtraction of tens and ones with equations, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 2 maths lesson on: Represent addition and subtraction of tens and ones with equations, 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 Comparing, ordering and partitioning 2-digit numbers unit, dive into the full primary maths curriculum, or learn more about lesson planning.