PROBLEMS ON ADDING AND SUBTRACTING POSITIVE AND NEGATIVE NUMBERS

If two numbers are having same signs, may be positive or negative. We have to add the numbers and put the greater number's sign for the answer.

If two numbers are having different signs, we have to subtract the smaller number from the larger number and put the greater number's sign for the answer.

Add.

Problem 1 :

9 + 16

Solution:

9 + 16

Since these are having same signs, so we add them.

= 25

Problem 2 :

-10 + (-10)

Solution:

-10 + (-10)

Since these are having same signs, we add them and put greater number's sign for the answer.

= -10 - 10

= -20

Problem 3 :

18 + (-26)

Solution:

18 + (-26)

Since the given two numbers are having different signs, subtract the smaller from larger and use the sign of the larger number to the answer.

= 18 - 26

= -8

Problem 4 :

-23 + (-15)

Solution: 

-23 + (-15)

Since these are having same signs, we add them and put greater number's sign for the answer.

= -23 - 15

= -38

Problem 5 :

-45 + 35

Solution:

-45 + 35

Since the given two numbers are having different signs, subtract the smaller from larger and use the sign of the larger number to the answer.

= -10

Problem 6 :

39 + (-38)

Solution:

Since the given two numbers are having different signs, subtract the smaller from larger and use the sign of the larger number to the answer.

= 39 - 38

= 1

Problem 7 :

-55 + 81

Solution:

-55 + 81

Since the given two numbers are having different signs, subtract the smaller from larger and use the sign of the larger number to the answer.

= 26

Problem 8 :

-61 + (-39)

Solution:

Since these are having same signs, we add them and put greater number's sign for the answer.

= -61 - 39

= -100

Problem 9 :

-74 + 36

Solution:

-74 + 36

Since the given two numbers are having different signs, subtract the smaller from larger and use the sign of the larger number to the answer.

= -38

Problem 10 :

-1 + (-8)

Solution:

Since these are having same signs, we add them and put greater number's sign for the answer.

= -1 - 8

= -9

Problem 11 :

13 + 15

Solution:

13 + 15

Since these are having same signs, so we add them.

= 28

Problem 12 :

19 + (-7)

Solution:

Since the given two numbers are having different signs, subtract the smaller from larger and use the sign of the larger number to the answer.

= 19 - 7

= 12

Problem 13 :

-14 + (-14)

Solution:

Since these are having same signs, we add them and put greater number's sign for the answer.

= -14 - 14

= -28

Problem 14 :

-12 + 10

Solution:

Since the given two numbers are having different signs, subtract the smaller from larger and use the sign of the larger number to the answer.

= -2

Problem 15 :

-5 + (-26)

Solution:

-5 + (-26)

Since these are having same signs, we add them and put greater number's sign for the answer.

= -5 - 26

= -31

Problem 16 :

-46 + 27

Solution:

-46 + 27

Since the given two numbers are having different signs, subtract the smaller from larger and use the sign of the larger number to the answer.

= -19

Problem 17 :

-33 + 55

Solution:

-33 + 55

Since the given two numbers are having different signs, subtract the smaller from larger and use the sign of the larger number to the answer.

= 22

Problem 18 :

-29 + (-25)

Solution:

-29 + (-25)

Since these are having same signs, we add them and put greater number's sign for the answer.

= -29 - 25

= -54