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Lesson18 |
Percentage
You can find
percentage very fast, no calculations, write only required answer
directly
10 % : Just divide the number by 10
Find 10% of 229 = 229/10 =22.9
12.5%: Just divide the number by
8
Find 12.5% of 208 = 208/8 =26
33 1% :
Just divide the number by 3
Find 331% of
270 = 270 /3 =90
3
3
25% Just
divide the number by 4
Find 25% of 296 = 296/4 =74
50% Just divide the number
by 2
Find 50% of 296 =296/2
148
75%: Just divide the number by
3/4
Find 75% of 208 = 208x3/4 =624/4=156
37.5% : Just divide
the number by 3/8
Find 37.5% of 240 = 240x3 /8
=90
15% Just multiply by 3
and divide by 20
Find 15% of 296 = 296x3/20 =888/20=44.4
and put proper decimal
45 % Just multiply by 9 and
divide by 20
Find 45% of 122 = 122x9/2 = 1098 =54.9
and put proper decimal
Hint use multiplication by 9 Lesson 5
55% Just multiply by 11
and divide by 20
Find 55 % of 132 = 232 x11/20 = 2553/20=127.65
and put proper decimal
Hint use multiplication by 11 Lesson 2( By using
same method we can calculate %of 35 ,85 ,95)
10.25% Calculate in two parts 10% & .25%
Find 10.25% of 240 : 10% of 240 + .25 % of 240
= 240/10 +240/400
= 25 +.6
= 24.60
25.25.% Calculate in two parts 25 % & .25%
Find 25.25%of 280 : 25%of 280 +
.25%of 280
= 280/4 + 280/400
= 70 + .7
= 70.7
56% Calculate in two parts 55%&1%
Find 56% of 780
55%of 780 +1 %of 780
= 780x11/20 +780/100
= 39x11 +7.8
= 429 +7.8
= 436.7
78% calculate in two parts 80%-2%
Find 78% of 1640
80 %of 1640 -2%of 1640
= 1640x8/10 -1640x2/100
= 1312
-32.8
= 1279.2
12% Calculate in two parts 10 %+2% Find 12 %of 268 26.8 +5.36 =32.16
26% Calculate in two parts 25%+1%
Find 26 %of 292
292/4 + 2.92 =73+2.92
=75.92
89 % Calculate in two parts 100%-11%
Find 89 % of 256
256 - 11x256/100 =256 -28.16
=227.84
Apply little presence of mind and calculate percentage as fast as you can.