1. 9 x 14 9 x 12 Calculate the value of the following: 1 4 × 5 =
Starter: Answer the questions below in your books
Calculate the value of the following:
1 4 × 5 =
(7 + 8) × 5 =
(28 ÷ 4) × (19 – 8) =
6 × (42 ÷ 7) =
20 × 30 =
25 × 37 =
9 x 14
9 x 12

2. 9 x 14 9 x 12 Mark your starter: 1 4 × 5 = 20 (7 + 8) × 5 = 75
Starter: Answer the questions below in your books
Mark your starter:
1 4 × 5 = 20
(7 + 8) × 5 = 75
(28 ÷ 4) × (19 – 8) = 77
6 × (42 ÷ 7) = 36
20 × 30 = 600
25 × 37 = 925
9 x 14
9 x 12

3. 2,3,5,7 Prime Numbers Eratosthene’s Sieve
Know how the ancient Greeks calculated prime numbers.
Know what a prime number is and know that 1 is not a prime.
Find prime numbers by calculating multiples

4. A prime number is any number that has exactly two factors
A prime number is any number that has exactly two factors. Prime numbers are really important in mathematics as they form the building blocks of the whole subject.
Numbers that appear as the answer in a times table question greater than one times something are not prime numbers.
In the exercise on your sheet, you have to go through each number crossing out all the numbers that appear in the two times table (with the exception of 1×2). Then you cross out all the numbers that appear in the three times table (with the exception of 1×3). Keep doing this up to the 12 times table. The numbers you should have left are the prime numbers. Remember though, 1 is not a prime number.

5. The answers are next…

6. 1 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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144

7. So the prime numbers you should have listed are:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 119, 127, 131, 133, 137, 139, 143