Exercise 4B
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
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
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
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
∴63,90,243,180,936 are divisible by 9
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
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