Prime count 🧮

How many prime numbers are below $20$?

How many primes are below $10$?

🔢 What is the GCD of 24 and 36?

Remainder 🧮

What is the remainder of $14 \div 7$?

🔢 How many prime numbers are there between 1 and 20?

What is the last digit of $7^4$?

Remainder 🧮

What is the remainder of $95 \div 10$?

Remainder 🧮

What is the remainder of $92 \div 9$?

Greatest common divisor 🔢

$$\gcd(9, 7) = \;?$$

Remainder 🧮

What is the remainder of $16 \div 5$?

🧮 What is the remainder when 100 is divided by 7?

🔢 GCD and LCM — evaluate each:

0️⃣ How many zeros are at the very END of $100!$ (100 factorial)?

Remainder 🧮

What is the remainder of $12 \div 11$?

Remainder 🧮

What is the remainder of $93 \div 8$?

Remainder 🧮

What is the remainder of $13 \div 4$?

Last digit 🔚

What is the last digit of $8^{4}$?

🔢 What is the LCM of 6 and 8?

Remainder 🧮

What is the remainder of $19 \div 7$?

Least common multiple 🔢

$$\text{lcm}(6, 11) = \;?$$

Greatest common divisor 🔢

$$\gcd(20, 15) = \;?$$

Greatest common divisor 🔢

$$\gcd(39, 43) = \;?$$

Last digit 🔚

What is the last digit of $4^{4}$?

Least common multiple 🔢

$$\text{lcm}(10, 8) = \;?$$

Prime count 🧮

How many prime numbers are below $10$?

Least common multiple 🔢

$$\text{lcm}(4, 4) = \;?$$

Greatest common divisor 🔢

$$\gcd(40, 24) = \;?$$

Least common multiple 🔢

$$\text{lcm}(4, 10) = \;?$$

🔚 What is the units digit of $7^{100}$?

Prime count 🧮

How many prime numbers are below $50$?

Least common multiple 🔢

$$\text{lcm}(7, 4) = \;?$$

Greatest common divisor 🔢

$$\gcd(33, 19) = \;?$$

➗ How many factors does 36 have?

Least common multiple 🔢

$$\text{lcm}(3, 3) = \;?$$

Greatest common divisor 🔢

$$\gcd(30, 27) = \;?$$

Count divisors ➗

How many positive divisors does $16$ have?

Greatest common divisor 🔢

$$\gcd(54, 49) = \;?$$

Least common multiple 🔢

$$\text{lcm}(11, 5) = \;?$$

Greatest common divisor 🔢

$$\gcd(39, 10) = \;?$$

Least common multiple 🔢

$$\text{lcm}(6, 4) = \;?$$

Prime count 🧮

How many prime numbers are below $30$?

Count divisors ➗

How many positive divisors does $29$ have?

Last digit 🔚

What is the last digit of $4^{5}$?

📖 A book has 100 pages, numbered 1 to 100.

How many DIGITS were printed to number all the pages?

Last digit 🔚

What is the last digit of $8^{9}$?

🔔 Bell A rings every 12 minutes, bell B every 18 minutes. They ring together at 07:00.

After how many minutes do they ring together again?

Count divisors ➗

How many positive divisors does $39$ have?

Count divisors ➗

How many positive divisors does $47$ have?

Count divisors ➗

How many positive divisors does $67$ have?

➕ What is the sum of all factors of 12?

Last digit 🔚

What is the last digit of $7^{10}$?

Last digit 🔚

What is the last digit of $6^{11}$?

Count divisors ➗

How many positive divisors does $42$ have?

Last digit 🔚

What is the last digit of $7^{7}$?

Last digit 🔚

What is the last digit of $4^{6}$?

Prime count 🧮

How many prime numbers are below $100$?