Mean hay Average là một trong những chủ đề kiến thức có trong chương trình Cambridge Primary, nhưng là mới với HS lớp 5 Việt Nam. Các câu hỏi trong bài này được trích từ chương trình toán Singapore online nổi tiếng tên là Koobits. Để học toán tiểu học Singapore đồng thời chuẩn bị tốt cho chương trình Cambridge cấp THCS, Koobits là chương trình học hiệu quả, tiết kiệm và vui thích (xem thêm tại http://contuhoc.com/koobits).

**Jane and Jean go **to shop** for clothes. Planning to buy a dress each, Jane gives Jean $20 so that they will have the same amount of money. They have an average of $94. How much money does Jean have at first?:** $.

**Nicole and Devi are friends from the school tennis team. They plan to buy a pair of tennis rackets each. They have an average of $161. If Nicole gives $52 to Devi, they will both have the same amount. How much does Nicole have at first?:** $

**A store is selling two kinds of water bottles. The average height of both water bottles is 46 cm. Bottle A is 8 cm shorter than Bottle B. What is the height of Bottle A?:** **cm**.

**There are two tall buildings in the city. The average height of the two buildings is 617 m. Building A is 334 m taller than Building B. What is the height of Building A?:** **m**.

**Lorraine and Dolores go to the same tuition center. They have to pay the tuition fees this week. They have an average of $48. If Lorraine gives Dolores $16, they will both have the same amount. How much money does Lorraine have at first?:** **$**.

**It's the start of a new school term. Catherine and Mary went to a bookstore to purchase textbooks. Mary gave $12 to Catherine so that they had the same amount of money. They had an average of $35. How much money did Mary have at first?: $**.

**The average timing of 3 students is 15 seconds. Student A and B both have a timing of 12 seconds. How much faster should student C run to achieve an average of 12 seconds?:** **seconds**.

**At the P.E. class, pupils help each other measure heights. The average height of Rita and Kate is 145 cm. Rita is 10 cm taller than Kate. What is the height of Rita?:** **cm**.

**Aquarium A contains 32 fish. Aquarium B contains 52 fishes. How many fish should be moved from B to A so that the number of fish in both aquariums are equal?:** **fishes.**

**Janice and Farah are friends from the school tennis team. They plan to buy a pair of tennis rackets each. They have an average of $165. If Janice gives $32 to Farah, they will both have the same amount. How much does Janice have at first?: $**.

Suri and Mina are friends from the school tennis team. They plan to buy a pair of tennis rackets each. They have an average of $124. If Suri gives $41 to Mina, they will both have the same amount. How much does Suri have at first?: $. |