Bài tập Reading dành cho HSG

Read and answer the questions below.
Basic math
You should use addition to help you add something to something else. You have downloaded sixteen songs. You add twenty-nine more.
16 + 29 = 45 songs
With addition, you can change the order of numbers:
16 +29 = 29 +16
Subtraction is the opposite of addition. You take something away from something else. With subtraction, you cannot change the order of the numbers:
70 – 30 ≠ 30 – 70
Multiplication is a fast way to add the same number many times. You might add 8 + 8 + 8 + 8, but you can multiply 8 four times. It’s faster! Like addition, you don’t need to worry about number order.
8 x 4 = 4 x 8
Division helps you separate something into equal groups. There are 55 students, and you want to devide them into five groups.
55 : 5 = 11 students in each group
To check your answer, just multiply 11 x 5. Like subtraction, you must not change the order of the numbers when you use division.
55 ; 5 ≠ 5 : 55
-When you use addition, can you change the order of numbers?
-What’s the opposite of addition? -What’s a fast way to add the same number many times?
-What helps you separate something into equal groups?

Answer the word problems.
-Matt had a birthday party. He invited thirteen friends from school, his six cousins, his three older sisters, and his parents. Everyone came. How many prople were at Matt’s party?
Answer: .......... people
-At Matt’s party, his parents and three of his cousins dis not gave him a present. All the other people at the party gave him a present. How many presents did Matt receive?
Answer: .......... people
-At Matt’s party, they played volleyball. Matt’s mother couldn’t play. There were four teams: red, blue, yellow, and green. How many people were on each team?
Answer: .......... people
-Matt’s father cooked three pieces of chicken for each person at the party. How many pieces did he cook?
Answer: .......... pieces