x/40
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1 x 100 = 100 2 x 50 = 100 4 x 25 = 100 5 x 20 = 100 10 x 10 = 100 20 x 5 = 100 25 x 4 = 100 50 x 2 = 100 100 x 1 = 100
3/20 = ?/100 x 100 so . . . . 20 goes into 100 5 times, so what is 3 times 5 (So the fraction will remain the same value) answer is 15, so . . . 15/100 x 100 = 15% let's try 36 over 50. 36/50 = ?/100 sooo 50 goes into 100 2 times, so 2x36/50 x 100 = 72/100 x 100 = 72% And so forth.
#1-3*20=60+2*20=100 #2- 200/2=100 #3- 2*20=40+2*20=80+2*10=100
To change a fraction to a percentage multiply by 100 over 1 6/100 x 100/1 = 6% But it is simpler to know 6/100 = 6% 20/100 = 20% 50/100 = 50% 1/100 = 1% See the pattern??
percentage = 50% % rate: = 50/100 * 100% = 50%