LESSON 2

 

Listen and complete sets:

 

Even number – an integer that is divisible by 2 (e.g. 24 = 2x12)

Odd number – an integer that is not divisible by 2 (e.g. 37)

 

Hypothesis : If a whole number ends in even number , then we can divide it by 2 ( it is divisible by 2)

Proof: 576 ends in 6, which implies that we can divide it by 2 ( which implies that it is divisible by 2)

 

Mathematical operations :

Addition (dodawanie) +

Subtraction (odejmowanie)

 

Multiplication (mnożenie) x

Division ( dzielenie ) : ( /)

 

The sum – the result of an addition 2 + 3 = 5

The difference – a value of expression obtained by subtraction 8 – 7 = 1

 

The product – the result of multiplying two or more numbers 4x 6 = 24

The quotient – the result of dividing one number by another 10 : 2 = 5

Even number – an integer that is divisible by 2

Odd number – an integer that is not divisible by 2

Prime number – number greater than 1, which has got only factors 1 and itself. (e.g. 5)

USEFUL PHRASES

 

 

Division – inverse operation to multiplication

Subtraction – the inverse operation to addition

order of operations – kolejnośc działań

Divide it without a calculator.

Consecutive number – kolejna liczba

sequence of numbers – ciąg liczb

READ ME

 

 

2 + 3 = 5 ( two plus three equals five)

8 – 7 = 1 (eight minus seven is one or

eight take away seven is one)

4 x 6 = 24 (four times six equals twenty

four)

10 : 2 = 5 ( ten divided by two is five or

ten by two is five)

 

Subtract 20 from 55. (Odejmij 20 od 55)

If you subtract 8 from 6 you will get a negative number. (Jeżeli odejmiesz 8 od 6 otrzymasz liczbę ujemną.)


FILL IN THE GAPS

 

 

12 is a even number because is …......... by ….....

 

The smallest positive odd number is......

 

The greatest negative even number is …...

 

The only factors of a prime number are ….... and …....... .

 


LABEL TRUE OR FALSE

 

 

 

6 a prime number. (T/F)

 

Any natural number is an even number. (T/F)

 

The difference of two positive numbers is always a positive number. (T/F)

COMPLETE SENTENCES

 

 

e.g.

5 is a natural number because it is a whole number greater than zero.

 

-129 is a integer number because is ...................................................

 

14 is positive number because it is …...................................

 

7 is an odd number because it is …................................


SELECT THE PHRASE THE BEST COMPLETES THE SENTENCE

 

            (must be, cannot be, can be but needn't be)

 

To evaluate correctly the expression 2x6 + 4x5 the rules for  order of operations …..................applied .

 

The sum of two even numbers …....... even number.

 

The product of two numbers ….........a positive number.

FALSE FRIENDS

Odd number – liczba nieparzysta

 

Odd – dziwny ( nie do pary)


TIME FOR PROBLEMS AND EXERCISES

 

  1. Which odd number comes next? 15,17,19,.......

     

  2. The even number that comes after 74 is …...

     

  3. Which number is missing from this sequence? 16,22,28,34,__,46

     

  4. Which sign makes the sentence true?
    16 – (10 – 9) ......... 9 + 6x2

     

  5. Listen and find solution !

 

 

 

That is student record !

 

calcutation.wav
Wave Audio File 816.0 KB

COMPLETE SETS

QUIZ

ADDITIONAL PROBLEMS

 

 

The sum of consecutive natural odd numbers :

 

3 numbers : 1+3+5 = 9 ( is divisible by 3)

4 numbers : 1+3+5+7 = 16 ( is divisible by 4)

5 numbers : 1+3+5+7+9 = 25 ( is divisible by 5)

6 numbers : 1+3+5+7+9 + 11 = 36 ( is divisible by 6)

 

The sum of x consecutive natural odd numbers is …....................

 

The sum of consecutive even natural numbers :

 

3 numbers : 2+4+6 = 12 ( is divisible by 3, 3X4 =12)

4 numbers : 2+4+6+8 = 20 ( is divisible by 4, 4x5 =20)

5 numbers : 2+4+6+8+ 10= 30 ( is divisible by 5, 5x6=30)

6 numbers : 2+4+6+8+ 10 + 12 = 42 ( is divisible by 6, 6x7=42)

 

The sum of x consecutive even natural numbers is ….....................

 

 

LESSON 2- MATERIALS

Worksheet for learners and teachers
Numbers2Learners.pdf
Adobe Acrobat Document 186.4 KB