New
New
Year 4
Use known facts from the 10 times table to solve problems involving the 9 times table
I can use known facts from the 10 times table to solve problems involving the 9 times table.
New
New
Year 4
Use known facts from the 10 times table to solve problems involving the 9 times table
I can use known facts from the 10 times table to solve problems involving the 9 times table.
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Lesson details
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.
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'
Teacher tip
Licence
This content is © Oak National Academy Limited (2024), licensed on
Open Government Licence version 3.0
except where otherwise stated. See Oak's terms & conditions (Collection 2).Lesson video
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Starter quiz
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6 Questions
Q1.
Identify the multiples of 10
25
99
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 =
Exit quiz
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6 Questions
Q1.
What fact can I use to efficiently calculate 7 × 9?
7 × 7
7 + 9
7 × 9 + 1
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?
1
9
10
Q5.
Use 21 × 10 = 210 to calculate 21 × 9 =
Q6.
Use 34 × 10 = 340 to calculate 34 × 9 =