1. Grow these factor bugs, their legs7 5 13 17 23

2. What’s special about these factor bugs?
They only have 2 legs! They are prime bugs! Numbers which have only two factors - 1 and itself are
PRIME NUMBERS

3. To identify prime numbers23 11 5 2
Prime Numbers 19 37 41 3
Learning Objective
To identify prime numbers 7 17 29 43 13 31 47

4. The prime numbers from 1 to 100! Pg 462 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100
Cross out 1. Leave 2 and cross out the rest of the multiples of 2. Leave 3 and cross out the rest of the multiples of 3 (some will already be crossed out). Leave 5 and cross out the rest of the multiples of 5 (some will already be crossed out). Leave 7 and cross out the rest of the multiples of 7 (all but three of them will already have been crossed out). The numbers left are prime numbers.

5. The prime numbers between 1 and 100 are:2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

6. Fill in the missing numbers:
The prime numbers up to 50 are:
2, 3, ____, 7, ____, 13, ____, ____, ____, 29, 31, ____, 41, ____, _____
2. Write down the only prime number between 90 and 100.
3. How many prime numbers are there between 50 and 80?
4. What is the first prime number after 100?
5. Which is the only even prime number?
6. Is 1 a prime number?
1) 5, 11, 17, 19, 23, 37, 43, 47. 2) 23, 29. 3) 97. 4) 7. 5) ) 2.

7. Fill in the missing numbers:
The prime numbers up to 50 are:
2, 3, ____, 7, ____, 13, ____, ____, ____, 29, 31, ____, 41, ____, _____
2. Write down the only prime number between 90 and 100.
3. How many prime numbers are there between 50 and 80?
4. What is the first prime number after 100?
5. Which is the only even prime number?
7. Is 1 a prime number? 5 11 17 19 23 37 43 47 97 7
101
1) 5, 11, 17, 19, 23, 37, 43, 47. 2) 23, 29. 3) 97. 4) 7. 5) ) 2. 2 No

8. Homework
Pg 46 Exercise 4c No. 4 , 5 and 8