Question

Using the divisibility test, determine the following numbers are divisible by 7.
a) 121
b)707

Answer 1

Answer:

a )121 not divisible

b ) 707 in divisivle

Answer 2

Answer:

A number is divisible by 4 if the number formed by last two digits is divisible by 4. i.e tens and ones place digits.

A number is divisible by 8 if the number formed by last three digits i.e hundreds, tens and ones place digits.

i) 572

by 4: last two digits are 72 and 72 is divisible by 4. Therefore, 572 is also divisible by 4.

by 8: last three digits are 572 and 572 is not divisible by 8.

ii) 726352

by 4: last two digits are 52 and 52 is divisible by 4. Therefore, 726352 is also divisible by 4.

by 8: last three digits are 352 and 352 is divisible by 8. Therefore, 726352 is also divisible by 8.

iii) 5500

by 4: last two digits are 00 and 00 is divisible by 4. Therefore, 5500 is also divisible by 4.

by 8: last three digits are 500 and 500 is not divisible by 8. Therefore, 5500 is not divisible by 8.

iv) 6000

by 4: last two digits are 00 and 00 is divisible by 4. Therefore, 6000 is also divisible by 4.

by 8: last three digits are 000 and 000 is divisible by 8. Therefore, 6000 is divisible by 8.

v) 12159

by 4: last two digits are 59 and 59 is not divisible by 4. Therefore, 12159 is also not divisible by 4.