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Grade 5 August 4th GCD & LCM Speed test

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Grade 5 August 4th GCD & LCM Speed test

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GCD & LCM basics

Created by

Veronica Mathenge
Veronica Mathenge
Kenya

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Grade 5 August 4th GCD & LCM Speed test
 

Grade 5 August 4th GCD & LCM Speed testOnline version

GCD & LCM basics

by Veronica Mathenge
1

Find the GCD (HCF) of 24 and 36.

2

Find the LCM of 8 and 12.

3

Using prime factorization, find the GCD of 18 and 30.

4

Using prime factorization, find the LCM of 15 and 20.

5

What is the GCD of 16 and 24?

6

What is the LCM of 16 and 24?

7

What is the GCD of 28 and 42?

8

Three bells ring every 6 minutes and 8 minutes. They ring together at 8:00 a.m. After how many minutes will they ring together again?

9

Two buses leave a station every 12 minutes and 18 minutes. When will they next leave together?

10

A teacher has 24 pencils and 36 rulers. What is the greatest number of identical sets she can make?

11

Find the missing number: GCD (18,__ ) = 6

12

Find the missing number: LCM (5,__ ) = 20

13

The GCD of two different prime numbers is:

14

The LCM of 4 and 6 is:

15

Find the GCD of 20 and 30.

16

Find the LCM of 6 and 9.

17

A farmer has 48 oranges and 60 mangoes. What is the greatest number of identical baskets he can make?

18

Three traffic lights change every 15 s, 20 s, and 30 s. After how many seconds will they all change together again?

19

Which statement is correct?

20

A school has 42 boys and 56 girls. They are divided into the greatest possible number of equal groups. How many groups are formed?

 
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