## HOW TO MULTIPLY TWO AND THREE DIGITS TRICKS

Math Trick

How to multiple  two and three digits with short trick helpful in many competitive exams

## TWO DIGIT MULTIPLY TRICKS

Two   digit-    AB * CD

Ist step                       B *D

2ND STEP                 A * D + B  * C

Last step                    A* C
For example   42*56

Ist step                        2 * 6 =12                         12
2ND STEP                     4* 6 + 2  * 5= 34          34
Last step                    4* 5=20                             15

203412

31  ß base digits
+      2042
———————-
2352

### THREE DIGITS MULTIPLY TRICKS

Three  digit-    ABC * DEF

Ist step                              C * F

2NDSTEP                        B * F + C  * E

3NDSTEP                      A  * F + B* E + c* D

4TH  STEP                    A*E+ B * D

Last step                    A*D

For example
346 * 527
Ist step                      6 * 7 =    42                      42
2ND STEP                    4* 7 + 6  * 2=  40            40
3ND STEP                  3 * 7 +  4* 2 + 6* 5=59     59
4TH  STEP                   3* 2+ 4 * 5 =26               26
Last step                  3* 5 =15                          15
Combine these term like this
15  2659 4042
2544  ß base digits
+     156902
———————-
182342

## simple and compound interest problems | simple interest aptitude questions | simple interest problems | compound interest questions | simple interest and compound interest | simple and compound interest aptitude | simple interest examples

Hi friends,
In this post we are about to learn how to calculate simple interest and compound interest problems with some short tricks. In exams we don’t have time to calculate on paper with formulas. we have to it in mind so quickly because Every second matter in examination hall.

Now, here are some shortcut tricks for Simple Interest (S.I) and Compound interest (C.I.) with these i think you sure have some help in these chapter

lets first thing to do is learn some PERCENTAGE basic.

### SIMPLE INTEREST

we have using these BASIC formulas

S.I. = PxRxT / 100

BUT there are some example how these shortcut tricks that

Type 1.

In how many years will a sum of money double itself at 12% per annum?
a. 6years 6 months
b. 7 years 6 months
c. 8 years 3 months
d. 8 years 4 months

Type 2.
at what rate of percent of simple interest will a sum of money double itself in 12 years?
a. 8%
b. 8.1/3%
c. 8.1/2%
d. 9.1/2%

Type 3.

The rate at which a sum become four times of itself in 15 years at simple interest will be?
a.15%
b. 17.1/2%
c. 20%
d. 25%

Type 4.

if a sum of money at simple interest double in 6 years. it will become 4 time in ?
a. 12 years
b. 14 years
c. 16 years
d. 18 years

Type 5.

How long will it take a sum of money invested at 5% p.a. by simple interest to increase it value by 40%?
a. 5 years
b. 6 years.
c. 7 years
d. 8 years

### COMPOUND INTEREST PROBLEMS QUESTION TRICKS

Type 1.
a sum of money place at compound interest double itself in 5 years. It will become 8 times itself at same rate of interest in ?
a. 7 years
b. 10 years
c. 15 years
d. 20 years

Type2.

By C.I. at 10 % p.a. a sum increased to 2662 in 3 years what will be the principal amount ?
a. 1000
b. 1500
c. 2000
d. 2500

Type 3.

In C.I, what will be the rate of interest if a sum becomes 1331 in 3 years?
a. 100

b.1000
c.10000
d. none of these

For more MATHS SHORTCUT TRICKS

## HEIGHT AND DISTANCE TRICKS

HI. FRIEND
IN MOST OF THE SSC EXAM THERE ARE 2-3 QUESTION ARE ON HEIGHT AND DISTANCE CHAPTER.
SO, HERE ARE SOME FORMULAS WITH YOU CAN DEAL WITH THIS CHAPTER

## ALGEBRA FORMULAS

(a+b)2 = (a2 +b2 +2ab)
(a-b)2 = (a2 + b2 – 2ab)
(a+b)2 + (a-b)2 = 2 (a2 + b2)
(a+b)2 – (a-b)2 = 4ab
(a2-b2) = (a+b) (a-b)
(a+b)3= a3 + b3 + 3ab (a+b)
(a-b)3 = a3 – b3 -3ab (a-b)
(a3+b3) = (a+b) (a2-ab+b2)
(a3-b3) = (a-b) (a2+ab+b2)
Arithmetic progression (A.P)
Series a, a+d, a+2d, a+3d,…….
First term = a
Difference = d
Then
nth term Tn = a + (n-1)d
sum of “n” term Sn = n/2 – (2a + (n-1)d)
sum of n term Sn = n/2 (a+L)
L = last term
Geometric progression (G.P)
a , ar, ar2,…….
First term = a
Difference = r
Then
nth term Tn = arn-1
sum of “n” terms Sn = a(rn – 1 )/ (r – 1)

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## TIPS FOR CALCULATE ADDITION FAST

In banking and  other exam candidates have to add very difficult number.
so, we suggest to  use your mental technique to find this in easy ways
Following are the examples how to add by converting number to base 100 or 10 technique with this we can add difficult digit easily.

Example 1
415 + 94 = ?
415 + (100 – 6)
515-6 = 509    instead of add 415 to 94, add 100 to 415 and subtracted 6 from it, that is the easy way and solving that MENTALLY without need of pen and paper.
Example 2
118 + 69 =?
118 + (70 – 1)
188 – 1= 187

taking bigger number

1305 + 1520 = ?
(1300 + 5 ) + ( 1500 + 20 )
(1300 + 1500) + ( 5 + 20 )
2800 + 25 = 2825 it is easy to 1300 to 1500 and add remaining digit to get answer quickly
Another example in decimals
50.05 + 7.05 = ?
(50 + 7 ) + ( 0.05 + 0.05 )
57 + 0.10 = 57.10

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## TRIGONOMETRY BASIC CONCEPT FOR SSC EXAM

DEFINITION OF TRIGONOMETRY :- trigonometry is the branch of mathematics that is concerned with calculating the angles of triangles or the lengths of their sides.

In this article we are provided the basic of trigonometry. Which are main topic in ssc exams. 4 –5 question are based on this topic in ssc exam and in the mainS of cgl 10 – 14 question are asked. So, it is the important one for preparation.

Basically we first provide basic concept and identities that are used to solving question based on trigonometry.

First of all you have to learn that following table.

in trigonometry there is no trick based question asked but if you learn the basic concept of trigonometry then you are easily solve within few seconds. Candidates find this is very tough topic to prepare for ssc some candidates leaves these chapter question in exam but this chapter is so easily prepare if you practice hard with this chapter by learn table and identities.

so, learn this following these helpful in solving question

 Ɵ SinƟ CosƟ TanƟ CosecƟ SecƟ CotƟ 0° 0 1 0 Not defined 1 Not  defined 30° 1 / 2 Ö3 / 2 1 / Ö3 2 2 / Ö3 Ö3 45° 1 / Ö2 1 / Ö2 1 Ö2 Ö2 1 60° Ö3 / 2 1 / 2 Ö3 2 / Ö3 2 1 / Ö3 90° 1 0 Not defined 1 Not defined 0
Some basic concept and  identities of trigonometry  Some question with solution that asked in previous ssc paper   ## TRIANGLE PROPERTIES OF GEOMETRY SECTION HELPFUL IN SSC EXAM

In the recent years ssc, upsc etc also includes geometry section to their exams.
2-4 question are always related to triangle of geometry. So, in this article we provide some basic tips with these tips you can solve question on triangle easily in the exams.

we mainly select some most important properties of triangle to prepare this section.

### HERE IS 10 MOST IMPORTANT PROPERTIES OF TRIANGLE    ## HOW TO SOLVE SIMPLIFICATION QUESTION CONTAIN DECIMAL DIGIT

In banking there is 10 – 15 question are on simplification. In which there are mixture of decimal, fraction, percentage, ratio etc but students are confused in solve this topics. These question are time consuming.

### In this article, we are given example how to convert decimal to significant figure with this we can find our answer in approximately value nearby to actual value

example
if we given 0.8 then this value is near to 1
14.40 than this value is near to 14
50.50 than this value is near to 51 not 50
so, we can convert decimal to significant figure to find approximate answer

MAINLY QUESTION ARE THIS TYPES

(13.96)2 – (15.03)2 + (18.09)2 -32.65 = ?

if we calculate are these value in examination hall. We can give more time to find out the exact answer.

But if we assume
(13.96)2  approx to 142
(15.03)2  approx to 152
(18.09)2 approx to 182
32.65 approx to 33

with these approximate value we can solve question easily to approx answer.We provide more EXAMPLES

With these approximate value we can easily find approx. answer