Flashcards in Number Properties Deck (17):

1

## What does HCF stand for?

### Highest Common Factor

2

## What does LCM stand for?

### Lowest Common Multiple

3

## What is a highest common factor?

### The biggest value that divides exactly into two other numbers

4

## What is a lowest common multiple?

### The small value that two different numbers both divide into

5

## List the factors of 12

### 1, 2, 3, 4, 6, 12

6

## List the factors of 40

### 1, 2, 4, 5, 8, 10, 20, 40

7

## What is the HCF of 12 and 20?

###
4

4 is the biggest number that divides into both 12 and 20

8

## What is the HCF of 72 and 60?

###
12

12 is the biggest number that divides into both 72 and 60

9

## What is the LCM of 12 and 20?

###
60

60 is the smallest number in both the 12 and 20 timestables

10

## What does it mean to write a number as 'a product of primes'?

### You need to write the number as a multiplication using only prime numbers. For example, 12 written as a product of primes is 2x2x3 or 2^2x3

11

##
Which of these numbers are prime?

1, 5, 15, 16, 17, 23, 27, 33

###
5, 17, 23

They can only be divided exactly by themselves and 1

12

##
Which of these numbers are square?

1, 5, 15, 16, 17, 23, 27, 33

###
1, 27

1 is 1x1x1 and 27 is 3x3x3

13

## List the prime numbers between 0 and 10

### 2, 3, 5, 7

14

## List the prime numbers between 10 and 20

### 11, 13, 17, 19

15

## List the prime numbers between 20 and 30

### 23, 29

16

## What is a prime number?

### A number which has only two different factors, itself and 1.

17