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Rhiannon19995
40% of 400 would be 160.
40% is 0.4 
so
0.4*400 = 160
to prove my work
400/160 = 0.4 = 40%
apologiabiology
40% of 400
percent means parts out of 100
40%=40/100=0.40

'of' means multiply
40% of 400 means
0.4 times 400=160

there's an easier way to do it
40% of 100=40
times 4 both sides
40% of 400=160