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Mental Maths

Choose the correct option. 21 st
1. Which of the following is NOT a factor of 18? Century #Critical Thinking
Skills
a. 3 b. 6 c. 9 d. 8
2. Which number is a multiple of 7?
a. 14 b. 15 c. 16 d. 18
3. How many factors does the number 12 have?

a. 4 b. 6 c. 8 d. 12
4. The LCM of 30 and 40 is:
a. 120 b. 150 c. 180 d. 200
5. Which number has only one factor?

a. 0 b. 1 c. 2 d. 3
6. LCM × HCF = __________ of the two numbers
a. Sum b. Quotient c. Difference d. Product
7. The HCF of 48 and 72 is:

a. 8 b. 16 c. 56 d. 24

21 st
Puzzle Century #Life Skills and Values
Skills
The King’s generous reward

Once upon a time, a wise king wanted to reward his three loyal ministers. He summoned them
to his royal court and said:
“You have all served the kingdom with great wisdom and loyalty. As a special reward, I offer
you three choices for receiving gold coins. Think carefully before you choose!”
Here were the choices:

• option 1: Start with 5 gold coins, and the amount will double every day for 7 days.
• option 2: Start with 3 gold coins, and the amount will triple every day for 7 days.
• option 3: Start with 1 gold coin, and the amount will be multiplied by 5 every day for

7 days.
Each minister chose as follows:
• Minister 1 chose option 1 (5 coins, doubling daily)
• Minister 2 chose option 2 (3 coins, tripling daily)

• Minister 3 chose option 3 (1 coin, multiplied by 5 daily)
The king gave them their starting amounts, and for 7 days, the coins multiplied just as promised.
Can you figure out which minister ended up with the most gold coins after 7 days? Calculate

the total number of gold coins each minister received by the end of the week. Which reward
would you have chosen?

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Multiples and Factors