Which numbers are all factors of 40?
1, 2, 4, 5, 8, 10, 20 and 40
1, 2, 4, 5, 9, 11, 20 and 40
1, 3, 4, 5, 7, 10, 20 and 40
Which numbers are the first five multiples of 6?
2, 3, 6, 12, 18 and 24
6, 12, 24, 36 and 42
6, 12, 18, 24 and 30
Which of these numbers is NOT a prime number?
2
31
9
How can 35 also be written?
\[3 \times 3 \times 3 \times 3 \times 3\]
\[3 \times 5\]
\[5 \times 5 \times 5\]
What is \(\sqrt{64}\)?
32
8
6.4
Write 12 as the product of its prime factors.
\[2 \times 6\]
2, 2, 3
\[2 \times 2 \times 3\]
Write 90 as the product of its prime factors.
\[2 \times 9 \times 5\]
\[2 \times 3 \times 3 \times 5\]
2, 3 and 5
Calculate the HCF of 12 and 90.
6
180
Calculate the LCM of 12 and 90.
1,080
A boy must take a red tablet every 20 minutes and a blue tablet every 35 minutes. If he takes both tablets at 12pm, what time will he next take both tablets together?
1:05pm
2:20pm
12:55pm