R1SI3r42jhkfA

Multiples of natural numbers

Source: licencja: CC 0.

Wielokrotności liczb naturalnych

Learning objectives

You will discover the notion of the multiple of the natural number.

Learning effect

  • You recognise and write the multiples of the natural numbers.

  • You identify the least common multiple of two natural numbers.

  • You use English to describe the least common multiple of two natural numbers.

R1ceOMAhQZlhm1
nagranie abstraktu

Prepare:

  • 10 cards with one of the following numbers: 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 written on each of them,

  • the tape measure,

  • paper clips.

RBEN9gUgdXK3m1
nagranie abstraktu

Today you are going to discover the multiple of the natural numbernatural numbernatural number. You are also going to identify the less common multiple of two natural numbers.

Task 1
ReVM4O9CrswF41
nagranie abstraktu

Analyse the slideshow concerning the multiple of number 5.

RAgvUKDGvuNue1
Pokaz multimedialny - wielokrotności liczby 5. Instrukcja obsługi z poziomu klawiatury: 1. Uruchomienie aplikacji - ENTER, 2. Na każdym ze slajdów czytany jest automatycznie tekst alternatywny po polsku, 3. Przy pierwszym uruchomieniu na pierwszym slajdzie, czytanie tekstu po angielsku - TAB, 4. Przejście między slajdami: do następnego slajdu - TAB, do poprzedniego slajdu - TAB + SHIFT, 5. Przejście do czytania napisu po angielsku - strzałka w górę + strzałka w dół (czyta tekst po angielsku widoczny na slajdzie).
Source: GroMar, licencja: CC BY 3.0.
R17AJpowwkfoN1
nagranie abstraktu

Consider:

  • Can we write down all the multiples of number 5?

  • What number is the largestthe largestthe largest multiple of number 5?

  • What number is the least multiple of number 5?

  • Is zerozerozero the multiple of every natural numbernatural numbernatural number?

  • What numbers are the multiples of zerozerozero?

  • What set do the multiples of number 1 make?

RjD8RPf0AY3Cg1
nagranie abstraktu

Note, that:

  • We cannot write all the multiples of number 5 because there is the infinite number of them.

  • Zero is the least natural multiple of number 5 and any other natural numbernatural numbernatural number.

  • Every multiple of zero equals zero.

  • Natural multiples of number 1 make the set of natural numbers.

Task 2
RjXH9zrduYXhs1
nagranie abstraktu

Write down six subsequent non‑zero multiples of the following numbers:

a) 4
b) 11
c) 25
d) 200

Task 3
R1INubZ40ToJf1
nagranie abstraktu

Write all the multiples of number 8 larger than 30 and less than 70. Use the measure tape to look for the least common multiplethe least common multiplethe least common multiple of two natural numbers.

Task 4
RnMku801J4pvQ1
nagranie abstraktu

Put the measure tape in front of you. Use the paper clips to determine first ten multiples of number 3. Next, using the paper clips determine first three multiples of number 9.

Answer the following questions:

  • Which numbers are indicated by using two paper clips?

  • Which number of these is the least?

Repeat the activity indicating first seven multiples of the number 12 and first three multiples of number 30. Answer the questions again.

Task 5
R10EJx4kslBto1
nagranie abstraktu

Analyse the illustration presenting the method of calculating the least common multiplethe least common multiplethe least common multiple of two numbers.

RGlftfrjBDS0r
The least common multiple
Source: GroMar, licencja: CC BY 3.0.

Looking at the illustration calculate the LCM of the natural numbers.

Task 6
R1ZtPqqjCzpQ71
nagranie abstraktu

Draw two of the cards you have prepared for the lesson. Determine and write by using the abbreviation LCM , the least common multiplethe least common multiplethe least common multiple of the drawn numbers. Repeat the activity three times.

Task 7
RtW6ylUL4jWNy1
nagranie abstraktu

Two ships leave the harbour at the same time on 2nd of July. The first one takes the cruises which last for 6 days, the other the cruises for 8 days. Which day are the ships going to meet at the harbour again?

Task 8

An extra task:

There are less than 30 students in a class. The teacher cannot divide them into groups of six or eight, because there is always one student left. How many students are there in this class.

R8xsHIYUroY651
nagranie abstraktu

Remember:

  • The multiple of the natural numbernatural numbernatural number is every number being the product of that number and any other natural number.

  • Every natural number has got the infinite number of the multiples.

  • Zero is the multiple of every natural number.

  • The least common multiplethe least common multipleThe least common multiple of two numbers is the least , non‑zero number which is the multiple of each of these numbers at the same time. We indicate it with the abbreviation LCM.

Do the summarising tasks.

Exercises

Exercise 1
R4iQLLzHtSANs
Wersja alternatywna ćwiczenia: Determine which sentences are true. Możliwe odpowiedzi: 1. The number 169 is the multiple of number 13., 2. The least common multiple of the numbers 3 and 12 is 36., 3. LCM(1, 40) = 40, 4. The number 24 is both the multiple of number 3 and number 4., 5. The number 15 is the multiple of the number 60.
zadanie
Source: GroMar, licencja: CC BY 3.0.
Exercise 2

Kate and Ann run around the pitch. It takes Kate 6 minutes to run one lap, Ann runs one lap in 9 minutes. The girls both started at noon from the same place and ran in the same direction. What time are they going to meet at the starting line again?

Exercise 3

Identify:

a) LCM(4, 7)|
b) LCM(5, 35)
c) LCM(6, 8)
d) LCM(8, 10)

Describe the method of identifying the least common multiple of the natural numbers in English.

Exercise 4
R1YXFBvU13iDj
Wersja alternatywna ćwiczenia: Indicate which pairs of expressions or words are translated correctly. Możliwe odpowiedzi: 1. wielokrotność liczby - multiple of a number, 2. najmniejsza wspólna wielokrotność dwóch liczb - the least common multiple, 3. liczba naturalna - natural number, 4. największa - the largest, 5. najmniejsza - infinite number of times, 6. nieskończenie wiele - the smallest
Rzadanie
Source: GroMar, licencja: CC BY 3.0.
R1MlTdqWAiNS21
Interaktywna gra, polegająca na łączeniu wyrazów w pary w ciągu jednej minuty. Czas zaczyna upływać wraz z rozpoczęciem gry. Jeden ruch to odkrywanie najpierw jednej potem drugiej karty z wyrazem. Każdy wyraz jest odczytywany. Kolejny ruch to odkrywanie trzeciej i czwartej karty. W ten sposób odsłuchasz wszystkie wyrazy. Nawigacja z poziomu klawiatury za pomocą strzałek, odsłuchiwanie wyrazów enterem lub spacją. Znajdź wszystkie pary wyrazów.
Source: Zespół autorski Politechniki Łódzkiej, licencja: CC BY 3.0.

Glossary

multiple of a number
multiple of a number

wielokrotność liczby

RckapjSaXinw31
wymowa w języku angielskim: multiple of a number
the least common multiple
the least common multiple

najmniejsza wspólna wielokrotność dwóch liczb

R1Fnkw3UyMwtl1
wymowa w języku angielskim: the least common multiple
natural number
natural number

liczba naturalna

R1MEfKqARFQJu1
wymowa w języku angielskim: natural number
the largest
the largest

największa

R1bStzJQs8FUV1
wymowa w języku angielskim: the largest
the smallest
the smallest

najmniejsza

RdBxnFiKhbB4W1
wymowa w języku angielskim: the smallest
zero
zero

zero

RmO0zcY3kPDsc1
wymowa w języku angielskim: zero
infinite number of times
infinite number of times

nieskończenie wiele

R1LvZgPxBnADD1
wymowa w języku angielskim: infinite number of times

Keywords

multiple of a numbermultiple of a numbermultiple of a number

the least common multiplethe least common multiplethe least common multiple

natural numbernatural numbernatural number

the largestthe largestthe largest

the smallestthe smallestthe smallest