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Exercise 1:

Exercise 2:

The sign of will be **positive **according to the sign rule -x- gives +.

The sign of will be **negative **because the sum of two negative numbers is negative.

the sign of the quotient will be** negative** (according to the rigle of signs) because gives .

Exercise 3:

Exercise 4:

1. .

2. .

3.

4.

Exercise 5:

How far down did it go?

It went down 21 meters.

Exercise 6:

1. (+2)- (+8) – (-4) – (-3)

– c. 2 – 8 + 4 + 3=1

2. (-7) – (-3) + (+5) – (+4)

– a. – 7 + 3 + 5 – 4 = – 3

Exercise 7:

Exercise 8:

a.

b.

c.

d.

e.

Exercise 9:

negative because an odd number with sign – .

: positive because an even number with sign – .

If C is the product of 303 times the number -1. What is the sign of the number C?

It will be negative because 303 is odd.

Exercise 10:

Exercise 11:

A=(- 5) + [(- 4) x ( – 2 ) + ( + 7)]

A=(- 5) + [(+8 ) + ( + 7)]

A=(- 5) +(+15)

A = 10

B=(- 4) x ( – 2)x( – 3) – ( – 3) x ( – 2)

B = -24 – (+6)

B= – 24 – 6

B= -30

C=(+ 6) – ( – 9) + (- 3) x [ ( – 5)x( -2) – 3]

C=6+9 + (- 3) x [ ( +10) – 3]

C=6+9 + (- 3) x 7

C=15 – 21

C= -6

Exercise 12:

1.

–

2.

–

Exercise 13:

Exercise 14:

Perform the following multiplications:

a.

b.

c.

d.

e.

Exercise 15:

What is the sign of each of the following calculations:

there are three minus signs, three is odd so the sign is negative.

There are six minus signs, six is even so the sign is positive.

If C is the product of 303 times the number -1. What is the sign of the number C?

There are 303 minus signs, the integer 303 is odd so the sign is negative.

Exercise 16:

Perform the following calculations (pay attention to the order of priority of the operations):

Exercise 18:

.

.

Exercise 19:

Exercise 20:

Exercise 21:

1. By what amount did it improve its results?

80 000-15 000 = 65 000 €

2. If its results increase by the same amount this year, what will its profit be next year?

65 000 – 15 000 = 50 000 €

Exercise 22:

Calculate:

Exercise 23:

Calculate:

Exercise 24:

## Answers to the exercises on relative numbers in 4th grade.

After having consulted the **answers to these ****exercises on relative numbers in 8th grade, you can return to the ****exercises in 4th grade**.

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