Lesson 12.
Prime and
composite numbers
Objective: To learn the importance of prime and composite numbers.
Keywords: Prime numbers, natural numbers, composite numbers.
Vocabulary
|
Nº |
English |
Spanish |
|
1 |
Activity |
Actividad |
|
3 |
By
using |
Utilizando |
|
5 |
But
also |
Sino
también |
|
6 |
Both |
Ambas |
|
7 |
Composite |
Compuesto |
|
8 |
Can
be |
Puede ser |
|
9 |
Circle |
Circula |
|
10 |
Classify |
Clasificar |
|
11 |
Colored
pencil |
Color |
|
12 |
Checking |
Comprobando |
|
13 |
Divisor |
Divisor |
|
14 |
Easier
way |
La manera
más fácil |
|
15 |
Except |
Excepto |
|
16 |
Find |
Encontrar |
|
17 |
Facilitate |
Facilitar |
|
18 |
Itself |
Sí mismo |
|
19 |
Identify |
Identificar |
|
20 |
Learn |
Aprender |
|
21 |
Not
only |
No solo |
|
22 |
Prime |
primo |
|
23 |
Paper |
Papel |
|
24 |
Point
out |
Resalta |
|
25 |
Remember |
Recordar |
|
26 |
Section |
Sección |
|
27 |
Table |
Tabla |
|
28 |
Taking
into account |
Teniendo
en cuenta |
|
29 |
Try |
Tratar |
|
30 |
Workshop |
Taller |
|
31 |
Way |
Manera |
Hi guys!
Welcome to your math class.
In this section, we're going to learn about
" Prime and composite numbers ".
General concepts
Prime numbers 2 divisors, the same number and the unit.
Composite numbers 3 or more divisors.
Natural numbers all the numbers; except the number 0.
let’s do
the next examples!
Prime numbers can be…
2, 3, 5, 7, 9, 11, 13, 17, 19, 21…
ATTENTION!
We don’t include the number 1
because it divides itself just in the multiplication table
number 1.
The way of to identify the prime numbers is by using the multiplication tables.
For example:
We can find the number 2 in the table 1 and 2.
1 x 2 = 2 2 x 1 = 2
We can find the number 9 in the table 1 and 9.
1 x 9 = 9 9 x 1 = 9
Composite numbers can be…
4, 6, 8, 10, 12, 14, 15, 16, 18, 20…
The way of to identify the composite numbers is by using the multiplication tables.
For example:
We can find the number 6 in the table 1, 2, 3, and 6
1 x 6 = 6 3 x 2 = 6
6 x 1 = 6 2 x 3 = 6
We can find the number 15 in the table 1, 3, 5 and 15.
1 x 15 = 15 3 x 5 = 15
5 x 3 = 15 Yes,
it’s very easy!
Let's watch the following video
Let's practice!
Activity n°1
Classify the next numbers as prime or composite numbers.
