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Question
Tap on the correct answer:
21 has a total of
Tap on the correct answer:
21 has a total of
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Solution
The correct option is C 4
Let's find the factors of 21 using rectangle shapes
Case (i):
Every number has 1 as its factor.
Every number is a factor of itself.
Hence, 21 and 1 are factors of 21.
∴ we can make a rectangle with dimension 1×21.
Case (ii):
21 can also be written as :
21=3×7
We can make a rectangle using dimensions 3×7
Thus, 21 has two more factors 3 and 7 which divides 21 evenly and leaves the remainder as zero.
∴ 21 has four factors which are 1, 3, 7, 21.
Let's find the factors of 21 using rectangle shapes
Case (i):
Every number has 1 as its factor.
Every number is a factor of itself.
Hence, 21 and 1 are factors of 21.
∴ we can make a rectangle with dimension 1×21.
Case (ii):21 can also be written as :
21=3×7
We can make a rectangle using dimensions 3×7
Thus, 21 has two more factors 3 and 7 which divides 21 evenly and leaves the remainder as zero.∴ 21 has four factors which are 1, 3, 7, 21.
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