Showing posts with label square roots. Show all posts
Showing posts with label square roots. Show all posts
Wednesday, January 6, 2010
Monday, December 7, 2009
Questions : Estimating Square Roots 12.07.09
3 Questions
5. Estimate each value, to one decimal place. Check your answer with a calculator.
a) square root of 14
My guess was 3.7 and when I checked the calculator, its 3.7. I found my answer using a number line.
_9_-> 14 <- _16_
3 4
b) square root of 86
My guess was 9.3 and when I checked it on the calculator it was 9.2.
_81_-> 86 <- _100_
9 10
c) square root of 136
My guess was 11.8 and when I checked it on the calculator it was 11.6.
_121_-> 136 <- _144_
11 12
12. While shopping online, ji Hon finds a square rug with an area of 11m2. He needs to know if it will fit in his 4m x 5m bedroom.
a) Estimate the side length of the rug, to one decimal place.
3.2m
b) check your estimate with a calculator.
3.3m
c) Will the rug fit? Explain.
Yes, the rug will fit in his room because the side lengths of his room is 4m x 5m, that would equals 20m2 and the rug's side length is 3.3m x 3.3m, that would equal to 11m2. The are of his room is greater than the area of the rug.
14. Alex is thinking of a number. The number has a square root between 7 and 8 and it is a multiple of 12.
a) What number could he be thinking of?
60
b) Is there more than one answer? Explain,
I dont think so. I think the answer is only 60because 60 is the only number that is a multiple of 12 that have a square root between 7 and 8.
Thanks for reading my post. Please let me know if I did a mistake. Thanks
Square Roots
The square root of a number can be thought of a side length of a square 16 square root =4 , the side length is 4cm.
The square root if a value is a number that when multiplied by itself equals a value.
5x6= 36 , 50 sqaurd 36= 6
In the prime factorization of a perfect square, there is an even number of each prime factor .
36= 2x2x3x3
Question :4. Estimate the square root of each number , to one decimal place . Check with a calculator.
a) 73
b) 103
c)55-
-a) 8.5
-b) 10.1
c-) 7.4
I picked that question because iwas done it. (;
Please Comment (;
Saturday, December 5, 2009
Camille's Scribepost for Dec. 4
Today in math class we had a quiz on estimating square roots. The Question was....
WITHOUT a calculator estimate the square root of 67. Use a number line to show all of your work.
After that we , corrected some of the pages in our homework book. Then we took a piece of looseleaf and folded it in half then, ripped it in the middle. On 1 side we put Perfect Square Chart. So we made a chart just like this one.
P.S sorry if the writing is too small.
Remember to do your homework on page 99, numbers 10,11,12,13,14,15,16,17,19,21
AND* use a number line for questions 4,5,7 and 9.
AND STUDY FOR THE UPCOMING TEST ON WEDNESDAY !
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