Mental Division
October 31st, 2007 | by limeehai |How is mental division done?
Let’s us do an example to illustrate:
40 / 7
Mental solution:
Step 1:
Break up as much as possible the original dividend 40 in term of 7 ==> (7 X 5) + 5
Step 2:
Divide the answer in step 1 by original divisor 7 ==> (7 x 5 )/7 + 5/7 = 5 + 5/7
Note: ( a + b ) / c ==> a / c + b / c
Answer : 5 5 / 7
Another example: 38 / 4
Mental solution: 38 / 4 ==> (4 x 9) / 4 + 2/4 ==> 9 + 1/2 ===> 9 1/2
This mental division had changed an improper fraction to mixed number.
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