Multiples and Factors

Which of these is NOT a factor of $20$?

Common factors of $12$ and $15$ are ________.

The factors of $22$ are $1, 2, 11,$ and ________.

Which number is a factor of $40$?

What is the second largest factor of $36$?

Which of these numbers has the same common factors as $18$ and $30$?

If $7 \times 13 = 91$, which of the following is true?

Which of these numbers shares the most common factors with the number $24$?

What is the highest common factor (HCF) of $54$ and $81$?

How many factors does the number $81$ have?

What is the LCM of $9$ and $6$?

Find the difference between the fourth multiple of $5$ and the second multiple of $5$.

Which number is a common multiple of $10$ and $20$?

What is the eighth multiple of $2$?

Find the LCM of $24$ and $32$.

If the LCM of two numbers is $24$ and one of the numbers is $8$, which of these cannot be the other number?

What is the LCM of $45$ and $60$?

Find the smallest number which when divided by $8$ and $12$ leaves a remainder of $5$, but when divided by $11$ leaves no remainder.

The ratio of two numbers is $4:5$. If their LCM is $120$, what is the sum of the numbers?

Find the smallest number that is exactly divisible by $3, 4, 5, 6,$ and $7$.

What number is at the top of a factor tree that has final prime branches of $2$ and $13$?

If a factor tree for $34$ has $2$ as one branch, what is the other branch?

In a factor tree for $80$, if the branches are $8$ and $10$, what are the prime factors of $10$?

In the factor tree for $72$, if we start with $8 \times 9$, what does the $9$ branch split into?

While creating a factor tree for $300$, you start with $3 \times 100$. If $100$ branches into $10 \times 10$, what are the prime factors for each $10$?

In a factor tree for $225$, if you branch it into $15 \times 15$, which prime factors do you get from each $15$?

Starting a factor tree for $175$ with $7 \times 25$, what will be the prime factors of $25$?

A factor tree for $441$ is built using the split $9 \times 49$. If $9$ is $3 \times 3$ and $49$ is $7 \times 7$, what is the sum of the distinct prime factors?

In the factor tree of $210$, the first level is $21 \times 10$. If $21$ splits into $3 \times 7$ and $10$ splits into $2 \times 5$, what is the difference between the largest and smallest prime factor?

A factor tree for $225$ starts with $15 \times 15$. If each $15$ is split into $3 \times 5$, how many prime factors are there in total, and what is their sum?

Which of these is a factor of both $16$ and $24$?

What is the $3^{rd}$ multiple of $12$?

Find the HCF of $30$ and $45$.

Which of these numbers is NOT a factor of $18$?

A person distributes $48$ chocolates and $72$ biscuits among children such that each child gets the same number of items and no items are left over. What is the maximum number of items each child can get if they only get one type of item?

What is the LCM of $8$, $12$, and $16$?

Two ropes are $16$ m and $20$ m long. They are to be cut into pieces of the same maximum length. What will be the length of each piece?

The LCM of two numbers is $180$ and their HCF is $6$. If one of the numbers is $30$, what is the other number?

A person has three iron bars whose lengths are $20$ m, $30$ m, and $40$ m. He wants to cut them into pieces of equal length. Find the least number of pieces he can get.

Find the greatest number which will divide $1600$ and $2020$ leaving remainders $6$ and $10$ respectively.