Find 10 more or 10 less than a given number
Lesson details
Learning outcome
I can find 10 more and 10 less than a number up to 200
Key learning points
- When you count in tens, the ones digit stays the same.
- When you count in tens, the tens and hundreds digits may change.
- Knowledge of place value can help when counting forwards across the 100 boundary.
Keywords
Multiple - The result of multiplying a number by another whole number.
100s boundary - The point at which the numbers change into 100s numbers, or from one set of hundreds to another.
Common misconception
Pupils may make errors when crossing the 100s boundary, either when adding or subtracting.
Emphasise that ten 10s are equal to 100. When using base ten blocks, pupils should be encouraged to change ten 10s into one hundred.
Teacher tip
Many pupils will find base ten blocks helpful to represent the problems in this lesson. They may also find number lines representations helpful too. Both support pupils in seeing the relative size of the numbers they are calculating with.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What number comes next? 10, 20, 30...
Q2.What number comes next? 80, 70, 60...
Q3.What number is represented by the base ten blocks?
Q4.What number is represented by the arrow?
Q5.What is the missing number? + 1 = 100
Q6.Match the equations to their answers.
95
93
94
92
Assessment exit quiz
6 Questions
Q1.What is 130 + 10?
Q2.What is 160 − 10?
Q3.What is 143 + 10?
Q4.Use the number line representation to help you calculate 123 − 10
Q5.What is 10 more than 94?
Q6.Pedro has a mass of 107 kg. Ping is 10 kg lighter. What is Ping's mass in kg?
To help you plan your 3 maths lesson on: Find 10 more or 10 less than a given number, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 3 maths lesson on: Find 10 more or 10 less than a given number, 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 Bridging 100: counting on and back in 10s, adding/subtracting multiples of 10 unit, dive into the full primary maths curriculum, or learn more about lesson planning.