Tues – 6th Dec- Prime Numbers & Square Numbers

LEARNING OBJECTIVE: discover how to find all the prime numbers and square numbers less than 100

SUCCESS CRITERIA: You will be able to list all the prime numbers and all the square numbers less than 100

STARTER: Write down the first 10 multiples of these 4 numbers

1. 2
   
2. 3
   
3. 5
   
4. 7
   

LESSON: Hand out a 10 x 10 grid to each student.

Work through these steps (Screen 6 of this lesson)

1. Cross out the number 1
   
2. Leave number 2 then cross out ALL OTHER multiples of 2
   
3. Leave number 3 then cross out ALL OTHER multiples of 3
   
4. Leave number 5 then cross out ALL OTHER multiples of 5
   
5. Leave number 7 then cross out ALL OTHER multiples of 7
   

Write down ALL the numbers that you have NOT crossed out

These are prime numbers, they cannot be divided exactly by any other numbers but themselves(and 1)

Now work out these 10 sums

1. 1 x 1 = 1
   
2. 2 x 2 = 4
   
3. 3 x 3 = 9
   
4. 4 x 4 = 16
   
5. 5 x 5 = 25
   
6. 6 x 6 = 36
   
7. 7 x 7 = 49
   
8. 8 x 8 = 64
   
9. 9 x 9 = 81
   
10. 10 x 10 = 100
    

Each of these sums can be represented by a pattern of dots – demonstrate on IWB get them to complete the pattern

Look at notation for writing 3 x 3 = 3²

Work through Ex 8C on page 183 of Foundation text book

PLENARY: getting students to describe primes and square numbers, feedback from students on confidence of finding all the primes and all the square numbers