Tips to solve quick math in ISSB

Percentage Questions and DISCOUNT % questions

1.    When % and value are in digits(1 to 9)

U have to count total n.o involve so it help in placing decimals and then multiply it

Like 1% of 1 = 0.01

2% 0f 2 =0.04

9% of 9 =0.81

2.    when % and value both are in double digit without any zero

Like…11% of 11= 1.21

12% of 12=1.44

19 % of 15 =2.85

3.    when value and % both r in double digit having 1 zero than u cancel the zeros

Like …20 % of 20=4

40 % of 30 =12

4.    when % and value both r in double and triple digit and having 1 zero so again cancel out the zeros

Like .20 % of 170=34

40% 0f 110=44

5.    when % are in digit and value are in double digit having 1 zero so so cancel out the zero

2% of 70=1.4

3% of 90=2.7

I will tell u remaining 2 cases later

DISCOUNT % QUESTIONS

Formula:       (discount % = real price – discount price)

E.g. ……..u have bought shirt of 450 rupee and 20% is discount so find real cost

So 20 % of 450= 90

Formula real price – discount price =450 -90 =360 is your ans

Profit and loss questions

Formula:       (profit = selling price – cost price /cost price into 100)

E.g. ….i have bought pen of 40 rupee and sell it with 50 rupee find out the profit

According to formula 50 – 40 /40 into 100=25 %

Loss question

I have bought book of 60 rupee and sell it with 40 rupee

Formula:       (cost price- sells price / cost price into 100)

So 60 – 40 /40 into 100=33.3%