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13.06.2020 •
Mathematics
Prajna is listing squares of two-digit numbers in such a way that the digit in their units place is 6. How many numbers should he have listed?
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Ответ:
2 (option B)
Question:
Prajna is listing squares of two-digit numbers in such a way that the digit in their units place is 6.
How many numbers should he have listed?
a) 9 b) 2 c)18 d) 20
Step-by-step explanation:
We would find the perfect squares that are two digit numbers
For two digit perfect squares:
Largest two digit number= 81 = 9²
Smallest two digit number= 16 = 4²
Total Two digit number perfect squares = Highest number - lowest number + 1
= 9-4+1 = 6
There are 6 two digit perfect squares
Next, we have to find how many of them have 6 in their units place.
The rule to be applied: If a number has 4 or 6 in the unit place, then its square has 6 in the units place.
Following this, the possibilities are 4², 6².
We have two of such numbers.
Therefore, he would have listed 2 numbers.
Ответ:
triangles are half a rectangle/square. So thats why you divide by 2. diving by 2 is also multiply by 1/2.
pyramids are in 3 dimensions, so since they are like half, but in three dimensions, you divide by 3, in other words multiply by 1/3.
Step-by-step explanation: