Examples with solutions for Addition and subtraction: Solving the problem

Exercise #1

9+31= 9+3-1=

Video Solution

Step-by-Step Solution

According to the rules of the order of arithmetic operations, we will work to solve the exercise from left to right:

9+3=11

11-1=10

 

And this is the solution!

Answer

11 11

Exercise #2

3+21= 3+2-1=

Video Solution

Step-by-Step Solution

According to the rules of the order of operations, given that the exercise only involves subtraction and addition operations, we solve the exercise from left to right:

3+2=5 3+2=5

51=4 5-1=4

Answer

4 4

Exercise #3

Solve:

93+42 9-3+4-2

Video Solution

Step-by-Step Solution

According to the rules of the order of operations, we will solve the exercise from left to right since it only has addition and subtraction operations:

93=6 9-3=6

6+4=10 6+4=10

102=8 10-2=8

Answer

8

Exercise #4

103+75= 10-3+7-5= ?

Video Solution

Step-by-Step Solution

According to the order of operations, solve the exercise from left to right since the only operations in it are addition and subtraction:

103=7 10-3=7

7+7=14 7+7=14

145=9 14-5=9

Answer

9

Exercise #5

7+5+2+1= -7+5+2+1=

Video Solution

Step-by-Step Solution

According to the rules of the order of arithmetic operations, we solve the exercise from left to right since it only has addition and subtraction operations:

7+5=2 -7+5=-2

2+2=0 -2+2=0

0+1=1 0+1=1

Answer

1 1

Exercise #6

902+98= ? 90-2+9-8=\text{ ?}

Video Solution

Step-by-Step Solution

According to the order of operations, we will solve the exercise from left to right since the only operations in it are addition and subtraction:

902=88 90-2=88

88+9=97 88+9=97

978=89 97-8=89

Answer

89

Exercise #7

3+41+40= 3+4-1+40=

Video Solution

Step-by-Step Solution

According to the rules of the order of arithmetic operations, we solve the exercise from left to right since it only has addition and subtraction operations:

3+4=7 3+4=7

71=6 7-1=6

6+40=46 6+40=46

Answer

46 46

Exercise #8

100+5100+5 100+5-100+5

Video Solution

Step-by-Step Solution

100+5100+5=105100+5=5+5=10 100+5-100+5=105-100+5=5+5=10

Answer

10

Exercise #9

1459+7+2= 14-5-9+7+2=

Video Solution

Step-by-Step Solution

Due to the fact that the exercise only involves addition and subtraction operations, we will solve it from left to right:

145=9 14-5=9

99=0 9-9=0

0+7=7 0+7=7

7+2=9 7+2=9

Answer

9 9

Exercise #10

12+64+1812= 12+6-4+18-12=

Video Solution

Step-by-Step Solution

Due to the fact that the exercise only involves addition and subtraction operations, we will solve it from left to right:

12+6=18 12+6=18

184=14 18-4=14

14+18=32 14+18=32

3212=20 32-12=20

Answer

20 20

Exercise #11

266+9+712= 26-6+9+7-12=

Video Solution

Step-by-Step Solution

Due to the fact that the exercise only involves addition and subtraction operations, we will solve it from left to right:

266=20 26-6=20

20+9=29 20+9=29

29+7=36 29+7=36

3612=24 36-12=24

Answer

24 24

Exercise #12

30+65+717= 30+6-5+7-17=

Video Solution

Step-by-Step Solution

Insofar as the exercise only involves addition and subtraction operations, we will solve it from left to right:

30+6=36 30+6=36

365=31 36-5=31

31+7=38 31+7=38

3817=21 38-17=21

Answer

21 21