# Edexcel GCSE Mathematics Chpt1

REVISION SHEET

Prime, LCM, HCF 1.1

A prime factor is a prime that is also a factor of a number. To express a number as its prime factors, use a factor tree. Circle all prime numbers and multiply the primes. LCM= Lowest Common Multiple

HCF= Highest Common Factor

Find HCF of 2 numbers by multiplying all common factors.

Find LCM of 2 numbers by Multiplying the HCF with remaining prime factors. Squares and Cubes 1.2

Square is a number multiplied by itself.

Cube is a number multiplied by itself twice.

Exam Tip: When multiplying or dividing, 2 numbers 2 same (both + or -) = positive, 2 different = negative. Order of Operation 1.3

(B)rackets

(I)ndices (includes sq root, cube root, powers)

(D)ivide

(M)ultiply

(A)ddition

Exam Tip: Don’t round numbers halfway through a calculation. Using a Calculator 1.4

Inverse of X sq = root of X or X ½

Inverse of X^y = X 1/Y

Reciprocal of N= 1/N or N^-1

Index Laws 1.5

a^n (format) is an Index.

Laws of Index: a^m x a^n = a^m+n

(a^m)^n= a^mxn

a^m / a^n= a^m-n

Exam Tip: Workout = evaluate, don’t leave as power.

EDEXCEL GCSE MATHEMATICS CHAPTER 1: NUMBER

REVISION SHEET

Prime, LCM, HCF 1.1

A prime factor is a prime that is also a factor of a number. To express a number as its prime factors, use a factor tree. Circle all prime numbers and multiply the primes. LCM= Lowest Common Multiple

HCF= Highest Common Factor

Find HCF of 2 numbers by multiplying all common factors.

Find LCM of 2 numbers by Multiplying the HCF with remaining prime factors. Squares and Cubes 1.2

Square is a number multiplied by itself.

Cube is a number multiplied by itself twice.

Exam Tip: When multiplying or dividing, 2 numbers 2 same (both + or -) = positive, 2 different = negative. Order of Operation 1.3

(B)rackets

(I)ndices (includes sq root, cube root, powers)

(D)ivide

(M)ultiply

(A)ddition

Exam Tip: Don’t round numbers halfway through a calculation. Using a Calculator 1.4

Inverse of X sq = root of X or X ½

Inverse of X^y = X 1/Y

Reciprocal of N= 1/N or N^-1

Index Laws 1.5

a^n (format) is an Index.

Laws of Index: a^m x a^n = a^m+n

(a^m)^n= a^mxn

a^m / a^n= a^m-n

Exam Tip: Workout = evaluate, don’t leave as power.

EDEXCEL GCSE MATHEMATICS CHAPTER 1: NUMBER

REVISION SHEET

Prime, LCM, HCF 1.1

A prime factor is a prime that is also a factor of a number. To express a number as its prime factors, use a factor tree. Circle all prime numbers and multiply the primes. LCM= Lowest Common Multiple

HCF= Highest Common Factor

Find HCF of 2 numbers by multiplying all common factors.

Find LCM of 2 numbers by Multiplying the HCF with remaining prime factors. Squares and Cubes 1.2

Square is a number multiplied by itself.

Cube is a number multiplied by itself twice.

Exam Tip: When multiplying or dividing, 2 numbers 2 same (both + or -) = positive, 2 different = negative. Order of Operation 1.3

(B)rackets

(I)ndices (includes sq root, cube root, powers)

(D)ivide

(M)ultiply

(A)ddition

Exam Tip: Don’t round numbers halfway through a calculation. Using a Calculator 1.4

Inverse of X sq = root of X or X ½

Inverse of X^y = X 1/Y

Reciprocal of N= 1/N or N^-1

Index Laws 1.5

a^n (format) is an Index.

Laws of Index: a^m x a^n = a^m+n

(a^m)^n= a^mxn

a^m / a^n= a^m-n

Exam Tip: Workout = evaluate, don’t leave as power.EDEXCEL GCSE MATHEMATICS CHAPTER 1: NUMBER

REVISION SHEET

Prime, LCM, HCF 1.1

A prime factor is a prime that is also a factor of a number. To express a number as its prime factors, use a factor tree. Circle all prime numbers and multiply the primes. LCM= Lowest Common Multiple

HCF= Highest Common Factor

Find HCF of 2 numbers by multiplying all common...

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