Natural Numbers
What is the smallest natural number?
1
List all the factors of 12.
1, 2, 3, 4, 6, 12
Is 7 a prime number?
Yes
Write the first five multiples of 6.
6, 12, 18, 24, 30.
What are the next three natural numbers after 25.
26, 27, 28
Give two numbers that have exactly three factors.
4 (1, 2, 4) and 9 (1, 3, 9).
What is the first five prime numbers.
2, 3, 5, 7, 11.
Is 48 a multiple of 8?
Yes, because 48÷8=648 ÷ 8 = 648÷8=6.
True or False: 0 is a natural number.
False
Find the HCF of 18 and 24.
HCF of 18 and 24: 6.
Which of these numbers are prime: 19, 21, 23, 25?
19 and 23 are prime.
Which numbers are common multiples of 4 and 6: 12, 18, 20, 24?
12 and 24 are common multiples of 4 and 6.
A bus can hold 48 people. If there are 5 buses, what is the total number of people they can carry?
240
Three friends are sharing 36 apples and 60 oranges equally. What is the greatest number of friends they can have so that the fruit is shared without leftovers?
12
Name all prime numbers between 30 and 50.
31, 37, 41, 43, 47
Find the smallest common multiple (LCM) of 9 and 12.
LCM of 9 and 12 = 36.
A stadium has 27 rows of seats, and each row has 36 seats. How many seats are there in total?
972
A bus arrives every 15 minutes and a train arrives every 20 minutes. If both arrive at the station at 9:00 am, at what time will they next arrive together?
10:00 am
A number has exactly two factors, 1 and itself. Prove that 29 is prime.
29 is prime becauseit is not divisible by 2, 3, or 5. Therefore, its only factors are 1 and 29.
A traffic light flashes every 12 seconds. Another flashes every 18 seconds. If they flash together at 12:00, when will they next flash together?
12:00:36 (LCM of 12 and 18 is 36 seconds).