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Add −1.25+2.5

Plot the first addend and the sum on the number.
Please tell the explain


Sagot :

Answer:

1.25

Step-by-step explanation (a):

Given expression:

[tex]-1.25+2.5[/tex]

A few changes were made to the expression.

Those were the following:

  • This expression can be written as [tex]2.5 - 1.25[/tex].
  • Let 2.5 be 2.50.

Subtract using column subtraction method:

             [tex]4[/tex]

______________

      [tex]2 \ \ . \ \ 5 \ \ \ \ \ 0[/tex]        

[tex]- \ \ \ 1 \ \ . \ \ 2 \ \ \ \ \ 5[/tex]

______________

      [tex]\ \ \ 1 \ \ . \ \ 2 \ \ \ \ \ 5[/tex]

Thus, the sum of −1.25 and 2.5 is 1.25.

Step-by-step explanation (b):

In this case, the first addend is the digit in the front of the expression.

⇒ a + b

a is the first addend

Thus, the first addend is -1.25.

The sum is the addition of two or more digits.

⇒ a + b = c

c is the sum

Thus, the sum is 1.25, which we calculated above.

Finally, let's plot the sum and the first addend on the number line.

View image Аноним

Let's see

  • -1.25+2.50
  • -125/100+250/100
  • -125+250/100
  • 125/100
  • 1.25
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