This document discusses factors and multiples, prime numbers, rounding and significant figures, and highest common factors and lowest common multiples. It defines a factor as a number that can be divided without a remainder, and a multiple as a number in a times table. Prime numbers have exactly two factors, 1 and themselves. Rounding involves looking at the digit after the place being rounded to. Significant figures depend on non-zero digits from left to right. Highest common factors are the largest numbers that divide two numbers, while lowest common multiples are the smallest numbers two numbers can be multiplied to produce.

1. BY LEON HEDMAN YEAR 7

2. FACTORS AND MULTIPLES.
A factor is a number that can be divided by another
number without a remainder.
Eg 3 is a factor of 6 because 3 goes into 6
A multiple is a number that is in the times tables.
Eg 64 is a multiple of 8 because 64 is in the 8 times
table.

3. Prime Numbers
What is a prime number?
It’s a number that has 2 ‘factors’ and cannot be divisible
by any other number apart from 1 and itself.
17 is a prime because it only has got 2 factors, 1 and 17.
Is 1 a prime number?
No because 1 only has 1 factor which is 1 and a prime
number has 2 factors so it is not considered a prime.

4. Rounding & Significant Figures.
Rounding is when you find the closest 10, 100,
1000,10000 to a specific number. To round you need to
look at the digit 1 step to the right depending on what
you round by.
Eg 64 to the nearest 10 is 60. We are rounding to the
nearest 10 so the number in the tens column would be 6.
If the number in the units column is 5 or higher, you
would round up but if the number is lower than five, you
wouldn’t say round down, you would keep it the same.
So 64 to the nearest 10 is 60.

5. Significant figures apply to rounding but its much more easier.
If you had the number 75,987 the first significant figure would be
7. Why I got 7 is because you would always have to start from the
left hand side.
From that number 75,987 7 has to be the first significant figure
because it’s the first digit from the left hand side of the number.
Can zero be a significant figure?
It depends. If the zero is in between 2 numbers that aren’t zero it
would count as a significant figure but if its at the end of a number
or in between 2 numbers that are zero it would not be a significant
figure.
Eg 73,730 That zero would not count because its at the end of that
number. WE WILL COME BACK TO THIS LATER.

6. HCF & LCM