2.2 The hcf and the lcm

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 1

C2 Numbers & Operations

Mr. Fintelman (FNL)

Friday October 4th

2024

Date	Friday October 4th 2024
Paragraph	§2.2 The hcf and the lcm
Pages from the handbook	Pag. 61-63
Subject	Prime numbers and factors The hcf and the lcm

Today is the day...

I can already…

1. … give the meaning of the words sum, difference, product and quotient.
2. … apply the order of operations.

Prior Knowledge

Arithmetics

After this lesson, I can…

1. … calculate the hcf and lcm.

Goals

Natural numbers - Bit of history

The Ishango Bone, found in Congo and about 20,000 years old, is one of the earliest tools used for counting or mathematical calculation. It features notches that may represent a counting system or lunar calendar.

Natural numbers - Bit of history

Natural numbers

Call out a natural number:

Prime numbers

Prime factors

Prime factors

What are the prime factors of...

24=

57=

876=

Prime factors

What are the prime factors of...

24=2⋅2⋅2⋅3

57=3⋅19

876=2⋅2⋅3⋅73

Hcf and lcm

Exercise 17 (Homework)

hcf(36,48)=

lcm(9,15)=

hcf(28,88)=

lcm(18,24)=

Exercise 17 (Homework)

hcf(36,48)=12

lcm(9,15)=45

hcf(28,88)=4

lcm(18,24)=72

Worktime

You work neatly by…

1. … reading the theory (again) before asking a question to your classmate.
2. … raising a hand before asking a question to the teacher.
3. … if the teacher is busy, remember your question and move on.
   

Help:

Exercises: N/A

Assignments:

Pages: 61-63

Exercises: 13, 14, 16, 17 and 20.

Assignments from the planning of WEEK 1:

Extra:

Exercises: 19

Now I can…

1. … calculate the hcf and lcm.

Reflection