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What is 126 rounded to the nearest 100?
100
How can you use estimation to check that you have placed the decimal point correctly in your product?
An estimate will give an indication of the order of magnitude of the answer. The decimal point determines the order of magnitude and so, if the two are in agreement, then the decimal point has been placed in the right place. However, if you did your arithmetic properly then there would be no need to do the extra calculations required for an estimate.
A vector of magnitude 3 cannot be added to a vector of magnitude 4 so the magnitude of the resultant is?
7
What is the magnitude of a real number without regard to it sign?
The magnitude of a real number is its value without regard to its sign.
What is 20 percent of one minute?
These types of questions were always the most fun in early mathematics. Remember the clock? It's broken not only into hours but minutes as well.Imagine that there are 60 seconds in one minute. So we know that an entire 60 seconds is 100% of a minute we can work back from there.How many 20% would you need in order to make 100%? You would need 5 (5 x 20 = 100)./ = per (60 seconds per 1 minute)60 seconds/1 minute ÷ 5 periods/1 minute = 12 seconds/periodSo 12 seconds would be exactly 20% of one minute.12 seconds (20%)24 seconds (40%)36 seconds (60%)48 seconds (80%)60 seconds (100%)
