Mathematics Stage 4 Quiz

The vertical axis / be / should / marked/ in equal intervals.

(Trục dọc phải được đánh dấu theo những khoảng bằng nhau.)

Here is part of a number sequence. 307, 207, 107, ...

The sequence continues in the same way.

Write the next two terms in the sequence.

Hint:

The sequence decreases (giảm) by 100 each time:

307 - 100 = 207

207 - 100 = 107

Continuing this pattern, the next two terms are 107 - 100 = ............... and 7 - 100 = ....................

• 7 and 93

• 7 and -93

• -7 and 93

Answer explanation

The sequence decreases (giảm) by 100 each time:

307 - 100 = 207

207 - 100 = 107.

Continuing this pattern, the next two terms are 107 - 100 = 7 and 7 - 100 = -93.

Thus, the next two terms are 7 and -93.

A packet of hamster food contains 900 g. A hamster eats 10 g of food each day. Write the number of days the packet of food lasts.

...... days

Answer explanation

To find out how many days the food lasts, divide the total amount of food (900 g) by the daily consumption (10 g).

900 g ÷ 10 g/day = 90 days. Therefore, the packet of food lasts for 90 days.

WHAT NUMBER IS DESCRIBED?

- The thousands digit is more than 6

• - The hundreds digit is even

• - The tens digit is not less than 5

• 6470

• 7248

• 7964

• 8075

• 9343

Everyone in a school goes on a visit to the zoo. The school hires 7 coaches. Each of the coaches is filled with 56 people. Calculate the total number of people on the 7 coaches.

Answer explanation

To find the total number of people, multiply the number of coaches by the number of people per coach: 7 coaches × 56 people/coach = 392 people. Therefore, the total number of people on the 7 coaches is 392.

Carlos visits the doctor on Thursday 25th March.

The doctor says, "Come back to see me again on Thursday in 3 weeks’ time."

Write the date that Carlos visits the doctor again.

• 15th April

• 16th April

• 17th April

• 18th April

• 19th April

Answer explanation

Carlos visits the doctor on Thursday, 25th March. Adding 3 weeks (21 days) brings us to Thursday, 15th April. Therefore, the date Carlos visits the doctor again is 15th April.

Rose puts her stamps in two equal piles.

Each pile has between 50 and 75 stamps.

She shares one pile equally between 3 friends. There are no stamps left.

She shares the other pile equally between another 5 friends. There are 2 stamps left.

Write all the possible totals of stamps Rose could have in each of her two equal piles.

• 57 and 72

• 51 and 69

• 50 and 75

• 54 and 66

Answer explanation

Each pile has between 50 and 75 stamps. (50 and 75 are not included)

For the first pile, divisible by 3 means possible values are 51, 54, 57, 60, 63, 66, 69, 72, 75.

For the second pile, divisible by 5 with 2 left means possible values are 52, 57, 62, 67, 72, 77.

The common values are 57 and 72.

• I used 23 beads to make the largest 4-digit number that rounds to 9000 when rounded to the nearest 1000.

• What number could I make?

• I used 23 beads to make the smallest 4-digit number that rounds to 9000 when rounded to the nearest 1000.

• What number could I make?

The time of the latest bus (chuyến xe buýt trễ nhất) she could get from Malden Fountain

(get off: xuống xe)

• 12:09

• 13:24

• 13:39

• 14:58

Answer explanation

Eva must be at her office before 2:15 PM.

• She gets off (xuống xe) at Lumley Park.

• It takes her 15 minutes to walk to her office from there.

So she must arrive at Lumley Park by:

2:15 − 15 minutes= 2:00 PM

So, we look at the bus timetable for Lumley Park:

• 12:28 ❌ (too early - before 2:00 p.m)

• 13:48 ✅ The latest bus she can get off at Lumley Park before 2:00 PM is 13:48 ( or 1:48 PM).

• 14:04 ❌ (too late — after 2:00)

• 15:24 ❌ (too late — after 2:00)

Now find the departure time (giờ khởi hành) from Malden Fountain to Lumley Park (plus 15 more minutes to walk from Lumley Park to her office)

Check Malden Fountain's times:

• 12:09 ❌ too early - arrive at Lumley Park at 12:28

• 13:24 ✅ The bus arrives at Lumley Park at 13:48 ( (plus 15 more minutes to walk from Lumley Park to her office)

• 13:39 ❌ (too late — arrive at Lumley Park 14:04)

• 14:58 ❌(too late — arrive at Lumley Park at 15:24