Question

Draw a number line model to determine each sum.

-2.1 + 0.8

Answer 1

-1.3


You would need to start at -2.1 then go right 0.8 spaces and you would get -1.3 which is also the same as 2.1-0.8 because adding integers with different signs is the same as subtracting the two numbers. To determine the sign, the sign with the greatest number would be the sign. Since -2.1 is greater, your sign would be negative.

Answer 2

-2.7

Explanation:

to add a decimal with a negative u must sub react them and If the negative is bigger than the positive than the negative over takes the positive and the awnser is negative.