Show you know pg.96
For each of the following,use perfect squares to estimate the square root to one decimal place.Check your answer with a calculator
Ok so baseicly what you have to do is look at your question=18squared draw a line and see what prfect squares are closest to it=4 times 4=16,5 times 5=25,.You put the lower number on the left side and the higher number on the right side. then you you look what numbert is in between 4.5 and put that in the middle UNDER the line. place 4 UNDER the left side of the line and write 5 UNDER the right side of the line. now its time to place 18 on the upper area of the line on the left side of 4.5 but on the right of 4 dont forget this one goes over the line so it should all look like this:
16 18 25 _________________________________________________________________
4 4.5 5
so baecly what you do now is estimate Id say the square root is about 4.2.If you want the exact answer type in 18 then hit the square button on you calculator and you get=4.2426406 and thats all there is to it.