We will solve the different types of problems involving addition and subtraction together.

To show the problem involving both addition and subtraction, we first group all the numbers with ‘+’ and ‘-‘ signs. We find the sum of the numbers with ‘+’ sign and similarly the sum of all the numbers with ‘-‘ sign and then find the difference.

1. Solve 3811 + 4629 – 1821 – 3164

Solution:

 Step I: Add the numbers with ‘+’ sign.Step II: Add the numbers with ‘-’ sign. Step III: Subtract the sum of the numbers with ‘-’ sign from the sum of the numbers with ‘+’ sign. Step 1

Note: If there is no sign before a number it means ‘+’ sign.

Answer: 3811 + 4629 - 1821 - 3164 = 3455

2. In godown A, there are 41,929 bags of rice and 31930 bags of wheat. In godown B, there are 31,556 bags of rice and 40,999 bags of wheat. Which godown contains more number of bags and by how much?

Godown A Number of bags of rice      =    41929

Number of bags of wheat                  = + 31930

Total number of bags                        =    73859

Godown B Number of bags of rice      =    31556

Number of bags of wheat                  = + 40999

Total number of bags                        =    72555

Total number of bags in godown A - Total number of bags in godown B

=     73,859 – 72,555

=     1,304

Therefore, godown A contains 1,304 bags more than that in godown B.

I. Solve the following:

(i) 5406 + 1809 – 3281

(ii) 2805 + 4961 – 1629 - 128

(iii) 3619 + 5410 – 2018 – 3110

(iv) 1529 + 402 + 506 – 1200

(i) 3934

(ii) 6009

(iii) 3901

(iv) 1237

II. Ron bought a plot for $2,55,000. He constructed a house spending$5,45,328 and sold it for $10,45,350. What is his gain? Answer: II.$2,45,022

III. Mr. X has a deposit of $3,68,750. Mr. Y has$7592 less than Mr. X. Mr. Z has $50,490 more than Mr. X. Calculate the deposit of Mr. Y and Mr. Z. Answer: III. Mr. Y :$ 361158

Mr. Z. : \$ 419240