One book costs $1.99. How much do four books cost?

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Answer 1 · 2017-05-22T20:49:47

#$7.96#

If one book costs #$1.99# then four books cost #4# times the price of #1# book. That is to say:

#$1.99*4=$7.96#

Answer 2 · 2017-05-22T21:53:09

A quick way to do this in your head (a sort of cheat)

#$7.96#

#$1.99# is the same as #$2.00# with an error of #+0.01#

#4xx$2=$8#

The error is #4xx0.01=0.04#

#$8.00-$0.04=$7.96#