Use known facts from the 10 times table to solve problems involving the 9 times table
Lesson details
Learning outcome
I can use known facts from the 10 times table to solve problems involving the 9 times table.
Key learning points
- If 9 is equal to 10 subtract 1 then 9 groups of 15 is equal to 10 groups of 15 subtract 1 group of 15
- Facts from the 10 times table can be used to solve problems involving the 9 times table.
- 10 times a number and 9 times a number are adjacent multiples.
Keywords
Array - An array is the layout of items (such as objects, numbers etc.) arranged in rows and / or columns.
Common misconception
Lack of fluency in 9 times tables and not understanding the problems.
To clearly model highlighting key words of worded problems to understand the problem and the operation required for the calculation. Continue to use language stems such as 'If I know...' 'Then I know...,' to support mathematical thinking.
Teacher tip
By this lesson, pupils should be fluent in the 9s and 10s. Continue to use language which reflects the relational pattern between 10s and 9s e.g. 'If I know that 9 × 10 = 90 then I know that 9 × 11 is 99 because you add one more group of 9'
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Identify the multiples of 10
Q2.Books cost £10 and Jun buys four. How much does he spend? £
Q3.Which multiple of 9 is missing from this sequence?
18, 27, , 45
Q4.What is 11 × 9 =
Q5.What is 15 × 10 =
Q6.What is 37 × 10 =
Assessment exit quiz
6 Questions
Q1.What fact can I use to efficiently calculate 7 × 9?
Q2.Complete: 7 × 10 − = 7 × 9
Q3.Complete: 10 × 12 − = 12 × 9
Q4.What do I need to subtract from 45 × 10 to find 45 × 9?
Q5.Use 21 × 10 = 210 to calculate 21 × 9 =
Q6.Use 34 × 10 = 340 to calculate 34 × 9 =
To help you plan your 4 maths lesson on: Use known facts from the 10 times table to solve problems involving the 9 times table, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 4 maths lesson on: Use known facts from the 10 times table to solve problems involving the 9 times table, 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 Represent counting in nines as the 9 times table unit, dive into the full primary maths curriculum, or learn more about lesson planning.