Revision (natural numbers, fractions, mixture problems)

If a is the divisor of b, find HCF(a;b)

• a

• 1

• b

• ab

• a/b

If a is the divisor of b, find LCM(a;b)

• a

• 1

• b

• ab

• a/b

If a and b are co-prime numbers, find LCM(a;b)

• a

• b

• a+b

• ab

• 1

If a and b are co-prime numbers, find HCF(a;b)

• a

• b

• a+b

• ab

• 1

If $HCF(a,b)=5,\ a\cdot b=150$ ,  $Find\ LCM(a,b)$  

• 15

• 30

• 5

• 60

• 150

1. When the number is divided by 19, the partial quotient is 3 and the remainder is 14. Find this number.

• 84

• 57

• 61

• 71

• 73

Which of the following is completely divisible by 9?

• 860000

• 1234567

• 1234568

• 8654321

• 8654328

How many prime factors does 60 have?

• 3

• 1

• 2

• 6

• 4

At least how long must be the wood in order to cut it into equal parts with lengths 60 cm and 50 cm?

• 300 cm

• 240 cm

• 280 cm

• 360 cm

• 320 cm

Find LCM(30;54)-GCF(30;54).

• 282

• 264

• 284

• 252

• 262