Line the decimals up!!
you can use:
-decimals squares/base ten
http://nlvm.usu.edu/en/nav/frames_asid_264_g_1_t_1.html
- Pencil & Paper
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| Add capthttp://www.coolmath.com/prealgebra/02-decimals/07-decimals-subtracting-01.htmion |
Multiplication
-Repeated addition: whole number times decimals
4x0.3=0.3+0.3+0.3+0.3=1.2
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Ratios
Part/whole or Part/part
Ratios can be written two different ways 6:14 OR 6/14 and just like fractions you should reduce a ratio so for 6/14 and 6:14, the number 2 can be divided into each so the simplified answer would be 3/7 or 3:7.
Now how rations appear in the real world is known as proportions, which is comparing two different ratios.
a/b=c/d
Example:
if a car gets 30 miles to the gallon of gas, How many gallons would it take for a trip of 420 miles?
you would lay it out as:
30 miles = 420 miles
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1 GAL X so you would cross multiply 30 times X to get 30X
and 420 times 1 which would give you 420
Then:
30X=420 and solve as a regular problem to get X alone
x= 420/30
x=14
Using the other way to write ratios:
30:1
420:___
so you would figure out how many times 30 goes into 420 which would be 14.
A little extra practice:
http://www.arcademicskillbuilders.com/games/dirt-bike-proportions/dirt-bike-proportions.html
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These blogs were very time consuming so I am gladly saying this is my last one =)
I will say though it helped me memorize what we were learning because I had to keep applying it, in class, then on the homework, then the lesson plans and the blogs.
