Exercise 3.3

1. Using divisibility tests, determine which of the following numbers are divisible by 2, by 3, by 4, by 5, by 6, by 8, by 9, by 10, by 11 (saying, yes or no):

Numbers

128

Yes

990

Yes

1586

275

Yes

6686

639210

429714

Yes

2856

Yes

3060

Yes

406839

2. Using divisibility tests, determine which of the following numbers are divisible by 4, by 8:

Instructions

572

726352

5500

6000

12159

14560

21084

31795072

1700

2150

divisible by 4

divisible by 8

divisible by 4,8

neither

3. Using divisibility tests, determine which of following numbers are divisible by 6:

Instructions

297144

1258

4335

61233

901352

438750

1790184

divisible by 6

not divisible by 6

4. Using divisibility tests, determine which of the following numbers are divisible by 11:

Instructions

5445

10824

7138965

70169308

10000001

901153

divisible by 11

not divisible by 11

5. Write the smallest digit and the greatest digit in the blank space of each of the following numbers so that the number formed is divisible by 3 :

Instructions

If a number is divisible by 3, the sum of its digits is also divisible by 3.

(a) 6724 (Enter the smallest number).

6724 (Enter the greatest number).

(b) 47652 (Enter the smallest number).

47652 (Enter the greatest number).

6. Write a digit in the blank space of each of the following numbers so that the number formed is divisible by 11

Instructions

A number is divisible by 11 if the of its digits is divisible by 11.

(a) The digit is 92389

(b) The digit is 89484

Playing With Numbers

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Exercise 3.3

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Playing With Numbers

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Glossary

Exercise 3.3