KS2 · Maths · Year 4
Use known facts from the 10 times table to solve problems involving the 9 times table
Represent counting in nines as the 9 times table
Learn it. Recall it. Make it stick.
IllumED Slides
IllumED · 1/6
Your learning goal
I can use known facts from the 10 times table to solve problems involving the 9 times table.
1 of 6
Use known facts from the 10 times table to solve problems involving the 9 times table: slides adapted from the imported teaching text; recall questions created from its keywords, learning points and common mistakes. Self-check practice, with no automatic grading or XP. Answers stay on this page and are cleared when you leave.
Original teaching resources
The original illustrated PowerPoint is available as well as the IllumED text slides. It retains the publisher’s design and credits.
Download original PowerPoint ↓What you’ll learn
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.
Words to know
- Array
- An array is the layout of items (such as objects, numbers etc.) arranged in rows and / or columns.
Common mistakes
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.
For parents, carers and teachers
- 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'