Question

a number changes from 40 to -30 .what is the increase or decrease in the number.......
with step by step​

Answer 1

Step-by-step explanation:

The number let us say x was first positive 40.(+40)

Now it decreases from +40 to -30.

How to find the decrease?

Simple, by subtraction.

How'z that?

Here, we will subtract -30 from 40.

So, we have

40-(-30)

And now we know that minus × minus is Plus or positive.

So, we have

40+30=70

So the number decreases 70 steps to go from 40 to -30.

Things to Remember:-

• Minus and Minus becomes Plus
• Minus and plus gives minus
• Plus and Minus gives minus
• Plus and Plus gives Plus

The Number Line

A line representing before and after numbers of zero.

______|_____|____|_____|______|_____|

3. 2. 1. 0. -1. -2

Here is a number line.

The forward of zero gives positive number and backward of zero gives negative number.