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How many integers from 1 to 63 are coprime to 63?
Correct answer(s):
- 36
What is the units digit of 17^381?
Correct answer(s):
- 7
Calculate the number of trailing zeros in 320!.
Correct answer(s):
- 78
Find the number of positive divisors of 60.
Correct answer(s):
- 12
Find the remainder when 17^91 is divided by 7.
Correct answer(s):
- 3
Find the LCM of 35, 38, and 43.
Correct answer(s):
- 57190
Determine the GCD of 171 and 84 without using prime factor tables.
Correct answer(s):
- 3
Find 20% of 166.
Correct answer(s):
- 166/5
Reduce the fraction 15/44 to lowest terms.
Correct answer(s):
- 15/44
What is the remainder when 4886 is divided by 6?
Correct answer(s):
- 2
Evaluate 132^2 − 90^2 using an arithmetic identity.
Correct answer(s):
- 9324
Find the sum of the arithmetic sequence 29, 33, 37, …, 133.
Correct answer(s):
- 2187
What is the units digit of 4^495?
Correct answer(s):
- 4
Calculate the number of trailing zeros in 210!.
Correct answer(s):
- 51
Find the number of positive divisors of 270.
Correct answer(s):
- 16
Find the remainder when 13^39 is divided by 17.
Correct answer(s):
- 4
Find the LCM of 23, 36, and 8.
Correct answer(s):
- 1656
Determine the GCD of 339 and 118 without using prime factor tables.
Correct answer(s):
- 1
Find 5% of 572.
Correct answer(s):
- 143/5
Reduce the fraction 18/90 to lowest terms.
Correct answer(s):
- 1/5