Skip to content / Đến nội dung
ThichHocToan.com

AMO 2022 – Primary 4 (Grade 4)

Question 1

There are three numbers, A, B and C. B is one-third more than A, C is one-fourth less than B. Which of the following is true about A and C?

Question illustration
  1. A is three-fourths of C
  2. A is the same as C
  3. C is four-thirds of A
  4. A is one-twelfth of C
  5. C is one-seventh of A

Question 2

A bag of letter blocks is arranged into a rectangular shape that is 18 blocks long and 8 blocks wide. If they are all arranged into a square shape, what is the width of the square?

Question illustration
  1. 36 blocks
  2. 25 blocks
  3. 8 blocks
  4. 12 blocks
  5. 64 blocks

Question 3

Three-sevenths of a number is 60. What is two-fifths of the number?

Question illustration
  1. 65
  2. 78
  3. 56
  4. 24
  5. 37

Question 4

Harvey was coloring a growing pattern on a large sheet of paper with small hexagons. He started from the upper left corner with one hexagon and then three hexagons, and so on. He was able to complete five steps before taking a rest, as shown in the picture. If he is able to complete the sixth step, how many small hexagons will he have colored in total?

Question illustration
  1. 24
  2. 30
  3. 32
  4. 36
  5. 64

Question 5

What is the product of all the natural numbers that divide evenly into ten?

(Natural numbers are whole numbers.)

Question illustration
  1. 100
  2. 60
  3. 120
  4. 50
  5. 48

Question 6

How many triangles, of all sizes, are there in the following figure?

Question illustration
  1. 5
  2. 7
  3. 8
  4. 4
  5. 6

Question 7

Katie has five different shirts, six different skirts, and five different hats, and four different pairs of shoes. In how many ways can she dress herself if we do not include other things?

Question illustration
  1. 50
  2. 5654
  3. 20
  4. 600
  5. 60

Question 8

Jake did a short survey of his classmates about their favorite fruit and made the following chart. Everybody took his survey. What percent of his classmates like apples?

Question illustration
  1. 18%
  2. 36%
  3. 60%
  4. 75%
  5. 80%

Question 9

Linda uses a passcode for her smartphone, which has four digits. Each digit is one of the 10 digits from {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}. How many choices does she have for her passcode?

Question illustration
  1. 1000
  2. 40
  3. 10000
  4. 100
  5. 400