Basics Concept of Simplification

As we all know that simplification is most widely asked topic in almost every banking exam. So let us try to understand what is actually meant by word ‘Simplification’.
Simplification means to find out a final answer for a complex calculation.
Simplification questions are asked to check the ability of a student to deal with numbers which can be in one of the following two types.
  • Sometimes, a calculation is given and one of the numbers is missing from the calculation. To find out the missing number, we have to approximate the given numbers or do the basic operations.
  • Sometimes all the numbers are given with some operations between them & we have to simplify the calculation.

Rules related to Simplification

Rule-(I) Replace ‘of’ by ‘Multiplication’ & ‘/’ by ‘Division’

Explanation: Whenever we find ‘of’ in a simplification problem, we can replace that by ‘multiplication(*)’. Similiarly ‘/’ can be replaced by ‘÷’.
Example: Find ¼ of 20
Solution: (¼) x 20 = 20÷4 = 5
Rule-(II) Always keep in mind the “BODMAS” rule. These operations have priorities in the same order as mentioned.
Explanation: Whenever we have more than one operation in the given calculation, we have to do the operations according to the priority specified by ‘BODMAS’
·                     B-Bracket
·                     O-Of (means multiplication)
·                     D-Division
·                     M-Multiplication
·                     A-Addition
·                     S-Subtraction
Example: Simplify: (2+3)*30
Solution: In this question, we have two things-Bracket & Multiplication. According to the BODMAS rule, we have to solve bracket first and not multiplication. So now coming to bracket, we have only one operation-Addition, so we will do addition.
(2+3)*30 = 5*30
Now we have only one operation to do – Multiplication
5*30 = 150
Example: Simplify: (2+5) of 80
Solution: In this question, we have three things – bracket, addition & of. Replacing ‘of’ by ‘multiplication’.
(2+5) of 30 = (2+5)*80
Now we have three things – bracket, addition & Multiplication. According to the BODMAS rule, we have to solve bracket first and not multiplication. So now coming to bracket, we have only one operation-Addition, we will do addition.
(2+5)*80 = 7*80
Now we will do multiplication.
7*80 = 560
Rule-(III) Multiplication & Division have same priority(Do that operation first which is on left).
Explanation: Though division has more priority than multiplication according to ‘BODMAS’ but we can perform multiplication first.
Example:  8*30/15
8*30 ÷ 15
Solution: In this question, we have two things – Multiplication & Division. So we can perform any operation first as they have same priority.
Doing Multiplication first:
240 ÷ 15
16
Doing division first:
8*2
16
Rule-(IV) Addition & Subtraction have same priority.
Explanation: Though addition has more priority than division according to ‘BODMAS’ but we can perform any of the two operations first.
Example:  30+40-15
Solution: In this question, we have two things – Addition & Subtraction. So we can perform any operation first as they have same priority.
Doing Addition first:
70 – 15
55
Doing Subtraction first:
30 + 25
55
Rule-(V) Don’t hesitate in rounding the numbers to nearest integers.
Explanation: Most of the times the numbers are given in such a way that you can round them quickly and get the answer (Rounding should be done or not, It can be realised by looking at the given options).
Example: (324.5*15)/(5.01*24.98)
Solution: (325*15)/(5*25)
=13*3
=39

Previous Year Questions Asked in Banking Exams from Simplification

Now let us see some of the previous year questions asked from ‘Simplification’ & try to apply the rules learnt so far.
Q.1) Simplify: 127.001 * 7.998 + 6.05 * 4.001
1.   1000
2.   1020
3.   1040
4.   1080
5.   None of these
Solution: Using the rounding concept
127 * 8 + 6 * 4
Using the BODMAS rule
1016 + 24
1040 (Option 3)
Q.2) What will come at place of ?: 9876 ÷ 24.96 + 215.005 – ? = 309.99
1.   270
2.   280
3.   290
4.   300
5.   310
Solution: Using the rounding concept
9875 ÷ 25 + 215 – ? = 310
Using the BODMAS rule
395 + 215 – ? = 310
610 – ? = 310
? = 300 (Option 4)
Q.3) What will come at place of a: (128 ÷ 16 x a – 7*2)/(72-8*6+a2) = 1
1.   1
2.   5
3.   9
4.   13
5.   17
Solution: Using the BODMAS rule
(8*a – 14)/(49-48+a2) = 1
(8*a – 14)/(1 + a2) = 1
8a – 14 = 1 + a2
a– 8a + 15 = 0
a=3 or 5 (Option 2)
Q.4) What will come at place of ?: 85.147 + 34.192*6.2 + ? = 802.293
1.   400
2.   450
3.   550
4.   600
5.   500
Solution: Using the rounding concept
85 + 35*6 + ? = 803
Using the BODMAS rule
85 + 210 + ? = 803
295 + ? = 803
? = 508 [approx. = 500] (Option 5)
Q.5) What will come at place of ?: 3/8 of 168*15 ÷ 5 + ? = 549 ÷ 9 + 235
1.   189
2.   107
3.   174
4.   296
5.   None of these
Solution: Using the BODMAS rule
(3*168÷ 8)*15 ÷ 5 + ? = 549 ÷ 9 + 235
(504÷ 8)*3 + ? = 61 + 235
63*3 + ? = 296
189 + ? = 296
? = 107 (Option 2)

Key points to remember related to Simplification:

  • · Replace ‘of’ by ‘Multiplication’.
  • · Replace ‘/’ by ‘Division’.
  • · Always do the operations in priority according to ‘BODMAS’.
  • · Division & Multiplication have same priority (Start from left).
  • · Addition & Subtraction have same priority.
  • · Rounding can be done to simplify problems.
  • · When the given options are very close then rounding doesn’t help much.
  • · Always look at the options before doing simplification that can help in elimination of options.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s