Year 7 Number Jeopardy

Highest Common Factor

100

What is the HCF of 15 and 25?

5

200

What is the HCF of 15 and 60?

15

300

What is the HCF of 48 and 72?

24

400

What is the HCF of 6, 15 and 42?

3

500

What is the HCF of 18, 13 and 21?

1

Lowest Common Multiple

100

What is the LCM of 4 and 6?

12

200

What is the LCM of 6 and 9?

18 

300

What is the LCM of 12 and 18?

36

400

What is the LCM of 3, 5 and 9?

45

500

What is the LCM of 3, 4 and 7?

84

Square Numbers

100

9² + 3² = 

90

200

13² =

169

300

10² - 8² - 6² =

0

400

17² =

289

500

21² =

441

Prime Numbers

100

Is 9 a prime number?

No

200

List the first 5 prime numbers?

2, 3, 5, 7, 11

300

How many prime numbers are there between 1 and 144?

34

400

List the prime numbers between 40 and 50

41, 43 and 47

500

List all the prime numbers between 80 and 100.

83, 89 and 97