You can multiply .4 by 2 and see the answer is .8.
You could also note that 10 percent of 2 is .2
Now 40 percent is 4 ten percents so .2+.2+.2+.2=.8.
Of course the two answers are the same, but the advantage of the second is many people can do it in there heads.
5 percent of 40 = 2 5% of 40 = 5% * 40 = 5%/100% * 40 = 0.05 * 40 = 2
.5% of 40 = .005 x 40 =.2 Another way to think of it: .5% is half a percent. One percent of 40 is .4; half of that is .2
40 percent
40% of 5 = 2
40%
5 percent of 40 = 25% of 40= 5% * 40= 0.05 * 40= 2
50 percent times 40 = 2050% * 40= 50%/100% * 40= 5/10 * 40= 1/2 * 40= 40/2= 20
40%
2% of 40 = 2% * 40 = 0.02 * 40 = 0.8
40% = 2/5
2% = 2/100 = 0.02 0.02 x 40 = 0.8 so, 2% of 40 = 0.8
40% = 40/100 = 2/5