Math Challenge Quiz

Peter watches a TV show which is 55 minutes long, not including the adverts. It has four adverts which break up the show into five equal parts. How long will the show last in total, including the adverts, if each advert is 4 1/2 minutes long?

• 75 minutes

• 71 minutes

• 73 minutes

• 68 minutes

• 60 minutes

Answer explanation

Orange juice is usually priced at £1.50 per bottle. How much would a bottle of orange juice cost if the price was reduced by 10%?

• £1.35

• £1.30

• £1.25

• £1.45

• £1.40

Answer explanation

10% of £1.50 is £1.50 ÷ 10 = £0.15. So the reduced price would be £1.50 − £0.15 = £1.35.

12 children each have a piece of fruit. 5 children have an apple, 4 children have an orange and the rest have a banana. Which of these statements is true?

• Exactly 1/2 of the children have an apple.

• Exactly 5/6 of the children have an apple or an orange.

• Exactly 70% of the children have an orange or a banana.

• Exactly 1/4 of the children have a banana.

• Exactly 30% of the children have an orange.

Answer explanation

12 − 5 − 4 = 3, so 3 children have a banana.

3/12 = 1/4

= (divide the numerator and denominator by 3). All the other statements are false.

Which of the following calculations is not equal to the others?

• 3/4 of 24

• 3/10 of 60

• 5% of 360

• 10% of 180

• 0.18 × 1000

There is normally 400 g of spinach in a pack. A special offer pack of spinach has 20% extra free. What is the mass of the special offer pack?

• 500 g

• 460 g

• 440 g

• 480 g

• 420 g

Answer explanation

10% of 400 g is 400 ÷ 10 = 40 g. 20% of 400 g is 2 × 40 = 80 g. So the mass of the special offer pack is 400 + 80 = 480 g.

Theo is making cupcakes. Each bag of flour he uses makes 12 cupcakes. Exactly how many bags of flour are needed to make 28 cupcakes?

• 2 1/2

• 3 1/3

• 3 1/12

• 2

• 2 1/3

Answer explanation

Which of the following is not equal to the others?

• 1/2 of 54

• 0.270 × 100

• 10% of 270

• 2/7 of 10

• 3/4 of 36

Dora has twelve 20p coins and eight 10p coins in her purse. She puts 1/3 of the 20p coins and 1/4 of the 10p coins into a charity box. How much money does Dora put in the charity box?

• £1.00

• £1.20

• £1.50

• 60p

• 80p

Answer explanation

31 of twelve is 12 ÷ 3 = 4, so she gives 4 × 20p = 80p in 20p coins. 41 of eight is 8 ÷ 4 = 2, so she gives 2 × 10p = 20p in 10p coins. So in total Dora puts 80p + 20p = £1.00 in the charity box.

Valter has 21 boxes to pack. He packs 14 out of the 21 boxes before he stops for lunch. What fraction of the boxes does he have left to pack?

• 3/10

• 2/3

• 1/3

• 1/2

• 1/4

Answer explanation

21 − 14 = 7 out of 21 boxes haven’t been packed, which is the same as 217. Divide the numerator and denominator by 7 to simplify to 31.

Which of the following numbers is the same as 18/8?

• 2.2

• 1.75

• 2.25

• 2.8

• 2.5

Answer explanation