>Estimate Decimal Products >------------------------- > >Estimate 4.2 x 0.843 > > 0.843 --------> 0.8 >x 4.2 --------> x 4 > ==== > about 3.2 > >Both factors are rounded >down. The actual product >is greater than 3.2. >This is probably not the way they want you to do it but I look at 0.843 and see that it is about 5/6 (.833), and that 4.2 is divisible by 6, so the result is about 4.2 / 6 * 5 = 3.5.