BIDMAS
8 + 4 × 2 = 24
(8 + 4) × 2 = 24
How many factors does 36 have? List them all.
1, 2, 3, 6, 4, 9, 12, 18, 36
List the first 5 multiples of 6
6, 12, 18, 24, 30
Express 90 as a product of its prime factors.
3^2 x 5 x 2
18 − 6 ÷ 3 = 4
(18 − 6) ÷ 3 = 4
Find the common factors of 18 and 30.
1, 2, 3, 6
List the first 3 common multiples of 3 and 5
15, 30, 45
Write 252 as a product of prime factors in index form.
2^2 x 3^2 x 7
12x9=108
10 + 5 − 3 × 2 = 24
(10 + 5 − 3) × 2 = 24
What is the GCF of 36 and 48
12
How many multiples of 12 are there between 1 and 150
12x12=144
A number is written as 2² × 3 × 5². What is the number?
300
(64-14)x5
=50x5
=250
24 ÷ 4 + 2 = 4
24 ÷ (4 + 2) = 4
A number has factors 1, 2, 4, 7, 14 and 28. What is the number?
28
What is the LCM of 12 and 15.
12, 24, 36, 48, 60
15, 30, 45, 60
15
5 × 2^3 + 4^2 − 3^2
45
=64x4-4
=256-4
=252
9 − 3 + 2 × 4 = 32
(9 − 3 + 2) × 4 = 32
A number is written as 2⁴ × 3². What is the number? list 5 factors not including 1 and 144.
144
1, 2, 72, 3, 48, 12, 24,
A number is a multiple of both 4 and 7. What is the smallest such number?
28
Express 72 and 60 in prime factor form eg factor tree. List the GCF and LCM
LCM = 1440
GCF = 12