Learning mathematics

Multiplication and division 2 If you were asked, how many 4 X 10, 2 X 10, 1200 X 10 and so on multiplication with 10, 100, 1000, must be quickly and easily we find the answer. Why is easy, because we only need to add zeros behind the number that multiplied by the number having a certain multiple of 10. How about multiplying the number 5? Almost similar. Multiplication number 5 the same as multiplying by 10 and dividing by the number 2. (5 = 10 / 2, is not it?) In my experience, the calculation is more easily processed even number diotak me than the odd numbers. If asked to answer 75 X 5, I will count it as 75 X (10: 2), aka 750: 2 = 375. The specialty item 2 of this can be developed to respond quickly calculated that can not be digested directly. Example, how the results of multiplication or 6.25 12.5 X 8 X 8? Instead of multiplying it directly, I will be more quickly calculated by converting the odd numbers into even by multiplying by 2 and divide the numbers are even colleagues with number 2. 12.5 X 8 ==> 25 X 4 ==> 50 X 2 ==> 100. The position calculation can be limited to the model equations that can directly digested, in the example above could be limited to 25 X 4. 6.25 X 8 ==> 12.5 X 4 ==> 25 X 2 ==> 50 The model above may be quickly calculated using a sample that is easy-easy (if you still use a sample that is difficult so the children learn mathematics dunk plus males) but can be seen that the model calculations can be utilized for other numbers, provided that one of the multiplier is even . If yes were 12.5 X 6.25 above models do not apply ... If necessary, we can do a combination of multiplication 5, 2 and 10 as well, depending on the situation and the example given problem. For example, 4.75 X 400 ==> 475 X 4 ==> 950 X 2 ==> 1900  

Difference Two Squares & Two squaring the Important What is the theoretical 12 X 8? What is the theoretical 29 X 31? What is the theoretical 25 X 15? 12 X 8 = 96 -> do not use a calculator yes, and mikirnya do not stay long, embarrassed in elementary school children. 29 X 31 = 899 25 X 15 = 375 29 X 31 can be used as equations (30-1) X (30 +1) ==> == 302-12> 900-1 ==> 899 25 X 15 can be used as the equation (20 +5) X (20-5) ==> == 202-52> 400-25 ==> 375 Tip two terms can be used with both multiplication can be broken down into the same model that will apply the formula: (A + B) X (A-B) = A2 - B2 Two tips above should be used by us to show that mathematics is fun to learn and can be applied directly in relation to daily.