# Edexcel GCSE Mathematics Chpt1

Topics: Divisor, Real number, Multiplication Pages: 33 (6930 words) Published: October 12, 2013
﻿﻿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 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...