Question

Which number-line model represents the sum of 1.25+(-0.75)?

Answer 1

Solution:

A few tips...

• Tip-1: If "+" and "-" are multiplied, it gives a result of "-".
• Tip-2: If "-" and "-" are multiplied, it gives a result of "+".
• Tip-3: If "+" and "+" are multiplied, it gives a result of "-".

Changing the sign of the given equation.

• 1.25 + (-0.75)
• => 1.25 - 0.75                                        [Sign changes according to tip-1.]

This could only mean that the arrow would go to 1.25 units forward. Then a second arrow will be drawn to go 0.75 units back.

The graph that matches with the above info is Option C.