LCM, HCF, Prime factorization

Which shows the prime factorization of 84?

• $2\times2\times3\times7$

• $2\times2\times3\times3\times7$

• $4\times21$

• $7\times21$

Four bells ring at intervals of 6, 7, 8 and 9 seconds respectively. After how many seconds do all the bells ring together?

• 504

• 508

• 512

• 516

Mary has 24 pastries and wants to share pastries with her 20 friends. The greatest number of pastries any friend can get

• 2

• 4

• 5

• 6

Lamp A lights up every 15 minutes and lamp B lights up every 20 minutes. If at 09.00 the two lights turn on together, the second lamp will turn on together again for the second time at ...

• 09.30

• 09.45

• 10.00

• 10.30

Maya had 16 red flowers and 24 yellow flowers.  She wants to make bouquets with the same number of each color flower in each bouquet.  What is the greatest number of bouquets that she can make?

• 4
• 2
• 48
• 8

Tags

CCSS.6.NS.B.4

Derek advises a patient to have a scale every 4 months and a polish every 6 months. If they have a scale and polish today, how long will they wait before they can have both during the same appointment?

• HCF

• LCM

Tags

CCSS.6.NS.B.4

Evaluate.

• -12
• 12
• ±12
• 1/12

Which of these is an irrational number?

• 0.33333333...
• √125
• 1/5
• 0

square root of 9801

Cube rootof 5832 =