Factors & HCF
What are all the factors of 30?
1, 2, 3, 5, 6, 10, 15, 30
What are the first four multiples of 7?
7, 14, 21, 28
Is 75 divisible by 3?
Yes (7 + 5 = 12, 12 is divisible by 3)
Is 332 divisible by 6?
No (not divisible by 3 — 3 + 3 + 2 = 8, not divisible by 3)
What is the HCF of 81, 135 and 189?
27
What is the HCF of 18 and 24?
6
What is the LCM of 3 and 4?
12
Is 572 divisible by 3?
No (5 + 7 + 2 = 14, not divisible by 3)
Is 402 divisible by 6?
Yes (402 even, 4+0+2=6, divisible by 3)
What is the LCM of 24, 32 and 40?
960
What are all the factors of 45?
1, 3, 5, 9, 15, 45
What are the first five multiples of 12?
12, 24, 36, 48, 60
Is 7020 divisible by 5?
Yes (ends in 0)
Is 8712+9 divisible by 9?
Yes (8721, 8+7+2+1=18, divisible by 9
Is 1295676 divisible by 9?
Yes (1+2+9+5+6+7+6=36, 36/9=4)
What is the HCF of 48 and 80?
16
What is the LCM of 15 and 20?
60
Is 4308+2 divisible by 2?
Yes (4310 is even)
Is 9200 divisible by 8?
Yes (last 3 digits 200, 200 ÷ 8 = 25, but not exact, so No)
Is 9543 divisible by 3, 6, and 9?
Yes (sum 9+5+4+3=21; divisible by 3; not divisible by 6 — not even; divisible by 9? 21÷9=2 remainder — No; so only divisible by 3)
What is the HCF of 66 and 132?
66
What is the LCM of 18 and 30?
90
Is 324534565 divisible by 5?
Yes (ends in 5)
Is 213456+8 divisible by 8?
Yes (213464, last 3 digits 464, 464 ÷ 8 = 58)
Is 2000340 divisible by 10, 5, 2, and 4?
Yes (ends in 0, so divisible by all except 4: last 2 digits, 40/4=10)