Arithmetic 2

Adjex Academy 1
ARITHMETIC TWO
by Adjex Academy
Written by Cynthia Ufuoma
Adjekukor

CONTENTS
oIntroduction
oPrime Factorization
oHighest Common Factor
oLowest Common Multiple
oRounding Integers
oContact Details
Adjex Academy 2

INTRODUCTION
 Any pair of natural number are called factors of their
product.
 E.g. what are factors of 18?
1 × 18 = 18
2 × 9 = 18
3 × 6 = 18
 Therefore, the factors of 18 are: 1, 2, 3. 6, 9 and 18.
Adjex Academy 3

Introduction
 A prime number is any natural number that is only
divisible by itself and one (1).
E.g. 2 ÷ 2 = 1 and 2 ÷ 1 = 2
 A Prime number only has two factors; itself and one
7 ÷ 7 = 1 and 7 ÷ 1 = 7.
9 is not a Prime number.
9 ÷ 3 = 3.
 Note that 1 is not a prime number because it is only
divisible by itself (1). Thus, it has only one factor.
Adjex Academy 4

PRIME FACTORIZATION
This is obtained by dividing a number by successively
increasing prime numbers.
E.g. 2, 3, 5, 7 …
 Find the prime factors of 24
Therefore, the prime factors of 24 are 2 × 2 × 2 × 3
Adjex Academy 5

HCF & LCM
HIGHEST COMMON FACTOR (HCF)
The HCF of two natural numbers is the largest factor
that they have in common.
LOWEST COMMON MULTIPLE (LCM)
 The LCM is the Lowest natural number two natural
numbers will divide into whole numbers of times.
Find the HCF and LCM of 24 and 32
Adjex Academy 6

HCF & LCM
First look for the prime factors
 24 = 2 × 2 × 2 × 3
 32 = 2 × 2 × 2 × 2 × 2
 HCF = 2 × 2 × 2 = 8
Adjex Academy 7

HCF & LCM
 LCM = 2 × 2 × 2 × 2 × 2 × 3 = 96
Adjex Academy 8

ROUNDING INTEGERS
 Integers are rounded to their nearest multiples of 10.
If the number is less than half way to the nearest multiples of
10, it is rounded down to the previous multiples of 10.
 But if the number is more than half way to the nearest
multiples of 10, it is rounded up to the nearest multiples of 10.
 And if the number is half way, it is either rounded down or up
to the nearest multiples of 10.
Adjex Academy 9

Rounding Integers
 Round the following to the multiples of 10.
34 ≅ 30
36 ≅ 40
35 ≅ 30 / 40
Adjex Academy 10

CONTACT DETAILS
Follow this YouTube link to watch the video on
Arithmetic 2
https://youtu.be/woSnNTlHBxc
Facebook: Adjex Academy
LinkedIn: Adjex Academy
Slideshare: Adjex Academy
Instagram: adjex_academy
E-mail: adjexacademy@gmail.com
Adjex Academy 11

THANK
YOU
FOR
LISTENING
Adjex Academy 12

Arithmetic 2

More Related Content

What's hot (20)

Similar to Arithmetic 2 (20)

Recently uploaded (20)

Arithmetic 2