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Monday, November 19, 2012

Quiz Tomorrow!

Tomorrow we have a quiz on adding, subtracting, multiplying and dividing with decimals.  Today in class we reviewed what would be on the quiz and completed some practice problems to help us prepare.  See below for the examples and information.

There are 18 questions on the quiz.

2 adding, 2 subtracting problems.  These are basic.  Just add or subtract after lining up the decimals.

2 multiplying problems.  Again, these are basic.  Ignore the decimals when you multiply then count space after the decimal to determine where to place the decimal

2 estimating word problems.

example 1:

example 2:
2 buying items problems.

1 word problem with numbers written in word form.


2 word problems.  The math is basic, but you need to determine if we should add, subtract, multiply or divide.

example 1:

example 2:

example 3:

1 logic problem.  You will need to determine if a decimal is in the right place, if an answer seems reasonable, what answer should be expected, etc.  I can't give too much information about this one, but if you think about how reasonable an answer should be and feel comfortable doing basic estimation with decimals, you can do this problem.

2 division problems.  Just like tonight's homework.  See examples way below.

2 division word problems.


Tonight's homework is to complete the Division worksheet and study for the quiz.  Since I want to give you as much time as possible on the quiz tomorrow, I am including the answers to tonight's homework just below.  Please correct your work at home if possible so that you can begin right away in class tomorrow!

Number 12 is a bit tricky and somewhat confusing.  Normally when we round things down, like in addition and multiplication, it makes our estimate smaller and therefore less than the actual answer.  But with subtraction and division, when we round down, it doesn't always do the same thing.  In this problem, rounding the divisor down means that each group is going to be a bit bigger, but since we rounded the dividend down by quite a bit, we were actually starting with much less.  By doing the actual math out, as I did below, we can see that this estimate is actually larger than the actual answer.  (By the way, I didn't finish the actual answer, but we can see enough to know that the actual answer is smaller.)  Tomorrow's quiz will not have a question like this, so please don't worry about it.  You should be able to estimate for examples like the ones provided up top.

Good luck studying!

-Miss K  :)

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