Look at the pairs of the numbers written on the board:

A. 12 and – 12

B. - 5 and 5

C. 2,5 and -2,5

D. $-\frac{3}{4}$ and $\frac{3}{4}$

Indicate these numbers on the number line and consider how they are situated by the zero.

Give the opposite numbers to the following numbers:

12, -5, 0, $-\frac{2}{3}$, $6\frac{3}{5}$, 0,6; -3,65.

Look at the pairs of the numbers written on the board:

12 and $\frac{1}{12}$

-5 and $-\frac{1}{5}$

$\frac{2}{5}$ and 2,5

Give the examples of the pairs of the numbers made in a similar way. Notice, they are the reciprocals.

The number 12 is the reciprocal of number $\frac{1}{12}$, because $12·\frac{1}{12}=1.$

The number – 5 is the reciprocal of the number $-\frac{1}{5}$, because $-5·\left(-\frac{1}{5}\right)=1.$

The number $\frac{2}{5}$ is the reciprocal of the number $\frac{5}{2}=2,5$, because $\frac{2}{5}·\frac{5}{2}=1.$

Write the reciprocals of the numbers: 1; $\frac{1}{2}$; $2\frac{3}{4}$; 0,7; (-9)

Indicate on the number line the following:

a) the opposite numberopposite numberopposite number of the reciprocal of numberreciprocal of numberreciprocal of number (- 2),

b) the opposite numberopposite numberopposite number of 4,

c) the reciprocal of 1,

d) the opposite numberopposite numberopposite number of (- 8).

An extra task:

Is the opposite numberopposite numberopposite number to the largest four- digit number the largest negative four‑digit number? Justify your answer.

Write to the following negative numbers the nearest integer and the opposite number to the number which you have found.

-12,8; $-5\frac{2}{3}$; -13,00; - 367,09; $-\frac{19}{3}$

Among the following numbers: -4; $\frac{2}{5}$; 0; $4\frac{3}{7}$; $\frac{16}{4}$; $\frac{30}{5}$; 8; $\frac{21}{8}$ there are five integers. Which are they?

Write the reciprocals of the numbers you have chosen.

Describe the integers in English.