Question
Identify the number that could NOT be a common denominator for the two fractions
and 
.
- 12
- 18
- 24
- 36
Hint:
In this question we have to check which of the following options is not common denominator of the given fractions and .And for that we will first calculate the least common denominator and then we will check the other multiples of and and the option which is not divisible by the least common denominator is the option which cannot be the common denominator.
The correct answer is: 18
The least common denominator is the lowest common multiple of the denominators of a set of fractions.
Step1: First we have to calculate the Least Common Denominator of and which is essentially the LCM of denominator of 
and 
.
Step2:
We know that Multiples of are:
And the multiples of are:
Step3:
Now we have to find the LCM of and .
From the above multiples of and it can be easily seen that the least common multiple of is 
Hence the LCD of the and is The option which is not divisible by will be the answer. Hence 18 which is not divisible is the answer.
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Make use of area model to determine the value of 441 ÷ 21.
We know that division is repetitive subtraction. So, we can subtract 21 from 441 again and again till we reach 0.
Make use of area model to determine the value of 441 ÷ 21.
We know that division is repetitive subtraction. So, we can subtract 21 from 441 again and again till we reach 0.
Make use of area model to determine the value of 6248 ÷ 71.
We know that division is repetitive subtraction. So, we can subtract 71 from 6248 again and again till we reach 0.
Make use of area model to determine the value of 6248 ÷ 71.
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5750 passengers are waiting in the airport to board a plane. Each plane can carry 250 passengers in a trip. The number of trips it requires to clear out all the passengers are
We know that division is repetitive subtraction. So, we can subtract 250 from 5750 again and again till we reach zero.
5750 passengers are waiting in the airport to board a plane. Each plane can carry 250 passengers in a trip. The number of trips it requires to clear out all the passengers are
We know that division is repetitive subtraction. So, we can subtract 250 from 5750 again and again till we reach zero.
Make use of area model to determine the value of 510 ÷ 30.
Division in maths is the process of breaking a number up into equal parts, and finding out how many equal parts can be made.
Make use of area model to determine the value of 510 ÷ 30.
Division in maths is the process of breaking a number up into equal parts, and finding out how many equal parts can be made.
Make use of the area model to determine the value of 3136 ÷ 64.
We can also it by simple division. As, Division in maths is the process of breaking a number up into equal parts, and finding out how many equal parts can be made.
Make use of the area model to determine the value of 3136 ÷ 64.
We can also it by simple division. As, Division in maths is the process of breaking a number up into equal parts, and finding out how many equal parts can be made.
A teacher places 50 books onto the shelves. If each shelf can hold 10 books, then the number of shelves the teacher can fill is __________.
Division is a repeated subtraction.
A teacher places 50 books onto the shelves. If each shelf can hold 10 books, then the number of shelves the teacher can fill is __________.
Division is a repeated subtraction.
Estimate and divide 281 ÷ 30.
An estimate is a number that closely approximates the answer to a mathematical computation.
Estimate and divide 281 ÷ 30.
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Estimate and divide 949 ÷ 90.
An estimate is a number that closely approximates the answer to a mathematical computation.
Estimate and divide 949 ÷ 90.
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