Page 23 - Math Smart - 7

c) Write a divisibility rule for 8. Hint: Check the divisibility of the last three digits of the
number.

d) List 6 seven-digit numbers that are divisible by 8. The numbers must not appear in the list
in Question 6a.

O Explore 3 as a factor.
a) Circle each number that has 3 as a factor.

214 888 2032 4416 1011 8889 1016 10 168 2226 134 904
b) What do you notice about all the numbers you have circled?

c) Write a divisibility rule for 3. Hint: Check whether the sum of the digits is divisible by
three.

d) List 6 five-digit numbers that are divisible by 3. The numbers must not appear in the list in
Question 7a.

O Explore 9 as a factor.
a) Circle each number that has 9 as a factor.
214 888 2032 4446 7011 8 889 1026 19 467 2226 734 904

b) What do you notice about all the numbers you have circled?

c) Write a divisibility rule for 9. Hint: Check whether the sum of the digits is divisible by nine.

d) List 6 six-digit numbers that are divisible by 9. The numbers must not appear in the list in
Question 8a.

O Explore as a factor.

a) Circle each number that has 6 as a factor.

214 888 2032 4416 1011 8889 1026 10 168 2226 134 904
b) What do you notice about all the numbers you have circled?

c) Write a divisibility rule for 6. Hint: Check whether the number is divisible by two and also
divisible by three.

d) List 6 six-digit numbers that are divisible by 6. The numbers must not appear in the list in
Question 9a.

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