Tuesday we talked about ratios. A ratio is a pair of positive numbers that is used to compare two sets, it can be written --a to b as a fraction a/b.Some may like to write it as a:b.Here is an example of a problem we did in class: What is the ratio of male to female members of the class, we can say 6 males and 14 females or we can write it 6:14. that would be your ratio. The presentations were very good, it is hard to believe this class is over after thursday but i guess all good things come to a end.
http://www.purplemath.com/modules/ratio.htm
Wednesday, March 9, 2011
Friday, March 4, 2011
Operations with Decimals
Today we talked about repeated addition with whole numbers and multiplication. An example of this would be --- 4 x 0.3 you would have to take 0.3 and add it four times, like so ---- 0.3 + 0.3 + 0.3 + 0.3 = 1.2.
We all so learned how to multiply decimals together and to move the decimal by how many places are behind thedecimal. This picture below shows the way to do it.
picture by coolmath.com
We talked about division with decimals with the Powers of Tens. An example of this would be----the number---2.3798662 / 1000 the question is which way would you move the decimal? the answer is to the left because we are dividing into 1000 pieces. I really like the refresher on decimals i had forgotten alot of it.
I just want to say i enjoyed the cookie very much.
Tuesday, March 1, 2011
Decimals
Today we learned about decimals which is defined as : any number written in base-ten positional numeration.
A decimal can be written as 25.2 that means to the left of the decimal we look at place value, and to the right of the decimal we are looking at number of decimal places. The number 25.2 can be expressed as twenty five and two tenths, because the left of the decimal you count ones,tens,hundreds,thousands.The right of the decimal you count tenths,hundreds,thousandths.The teacher showed us how to used shaded decimals squares to let us see how it looks with a flat of 100. An example of this would be if you have 100 blocks and one block was shaded in it would represent 0.01 because, since the flat we are using is 100 the numbers to the right of the decimal would be the tenths place and the hundredths place. I enjoyed learnig about decimals again to refresh my skills. The presentations were very good .Here is a good video on decimals.
A decimal can be written as 25.2 that means to the left of the decimal we look at place value, and to the right of the decimal we are looking at number of decimal places. The number 25.2 can be expressed as twenty five and two tenths, because the left of the decimal you count ones,tens,hundreds,thousands.The right of the decimal you count tenths,hundreds,thousandths.The teacher showed us how to used shaded decimals squares to let us see how it looks with a flat of 100. An example of this would be if you have 100 blocks and one block was shaded in it would represent 0.01 because, since the flat we are using is 100 the numbers to the right of the decimal would be the tenths place and the hundredths place. I enjoyed learnig about decimals again to refresh my skills. The presentations were very good .Here is a good video on decimals.
Subscribe to:
Comments (Atom)