Use known facts to add and subtract to and from multiples of 100
Lesson details
Learning outcome
I can add to and subtract from multiples of 100.
Key learning points
- When you add a one-digit number and a multiple of 100, only the 1s digit changes.
- When you subtract a one-digit number from a multiple of 100, the 100s, 10s and 1s digits change.
- When you add a 10s number and a multiple of 100, only the 10s digit changes.
- When you subtract a 10s number from a multiple of 100, the 100s and 10s digits change.
Keywords
Multiple - A multiple is the result of multiplying a number by another whole number.
Common misconception
Pupils may need help using number pairs that total 10 to support their thinking in this lesson.
Make explicit connections between number pairs that total ten and the learning (e.g. 10 - 3 = 7 so 100 - 7 = 93 and 100 - 30 = 70).
Teacher tip
Base ten blocks and number lines will help support pupils' thinking and enable them to represent their calculations. Encourage pupils to use number pairs that total 10 and multiples of ten that total 100 to subtract from 100s numbers.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Which numbers are multiples of 100?
Q2.100 + 5 =
Q3.What is 100 − 3?
Q4.100 − 30 =
Q5.Which pairs of numbers could make this calculation correct?
Q6.What number is missing from the bar model?
Assessment exit quiz
6 Questions
Q1.Which calculations equal a multiple of 100?
Q2.What is 400 − 20?
Q3.Match the equations to the correct answer.
240
250
260
230
Q4.600 − 8 =
Q5.Paul is 70cm tall. The boxes are 200 cm high. What is their total height in cm? cm
Q6.The total height of Paul and the boxes is 400 cm. Paul is 70 cm tall. How high are the boxes in cm? cm
To help you plan your 3 maths lesson on: Use known facts to add and subtract to and from multiples of 100, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 3 maths lesson on: Use known facts to add and subtract to and from multiples of 100, 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 Representing 3-digit numbers, comparing and positioning on number lines unit, dive into the full primary maths curriculum, or learn more about lesson planning.