S.chand publication New Learning Composite mathematics solution of class 8 Chapter 4 Playing with Numbers Exercise 4B

 Exercise 4B

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Q1 | Ex-4B |Class 8 | Playing with Numbers |S.Chand | New Learning Composite | myhelper

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Question 1

Which of the following numbers are divisible by 2?

57,43,60,93,216,365,890,992

Sol :

57,43,93,365 not are divisible by 2

$60=\frac{60}{2}=30$ ,$216=\frac{216}{2}=108$ , $890=\frac{890}{2}=445$ ,$992=\frac{992}{2}=30$

∴60,216,890,992 are divisible by 2

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Q2 | Ex-4B |Class 8 | Playing with Numbers |S.Chand | New Learning Composite | myhelper

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Question 2

Which of the following numbers are divisible by 3?

24,73,48,105,134,726,184,915

Sol :

73 not divisible by 3

$24=\frac{24}{3}=8$ ,$48=\frac{48}{3}=16$, $105=\frac{105}{3}=35$  ,$726=\frac{726}{3}=242$ , ,$915=\frac{915}{3}=305$

∴24,48,105,726,915 are divisible by 3

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Q3 | Ex-4B |Class 8 | Playing with Numbers |S.Chand | New Learning Composite | myhelper

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Question 3

Which of the following numbers are divisible by 5?

30,94,57,210,305,640,740,985

Sol :

94,57 not divisible by 5

$30=\frac{30}{5}=6$ , $210=\frac{210}{5}=42$, $305=\frac{305}{5}=61$, $640=\frac{640}{5}=128$ , $740=\frac{740}{5}=148$ , $985=\frac{985}{5}=137$

∴30,210,305,640,740,985 are divisible by 5

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Q4 | Ex-4B |Class 8 | Playing with Numbers |S.Chand | New Learning Composite | myhelper

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Question 4

Which of the following numbers are divisible by 9?

63,90,715,243,514,180,791,936

Sol :

715,514,791 not divisible by 9

$63=\frac{63}{9}=7$ ,$90=\frac{90}{9}=10$ ,$243=\frac{243}{9}=27$ ,$180=\frac{180}{9}=20$ ,$936=\frac{936}{9}=104$

∴63,90,243,180,936 are divisible by 9

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Q5 | Ex-4B |Class 8 | Playing with Numbers |S.Chand | New Learning Composite | myhelper

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Question 5

Which of the following numbers are divisible by 10?

57,80,140,400,670,958,985,990

Sol :

57,958,985 are not divisible by 10

$80=\frac{80}{10}=8$ ,$140=\frac{140}{10}=14$ ,$400=\frac{400}{10}=40$ ,$670=\frac{670}{10}=67$ ,$990=\frac{990}{10}=99$ ,

∴80,140,400,670,990 are divisible by 10