# Class 4 Maths - Computation Operations - Important Questions

Posted by **Olympiad Tester** on

**Q1)John had 640 Singapore stamps and 450 Malaysian stamps in his collection. He exchanged some of his Malaysian stamps for an equal number of Singapore stamps. He now has 4 times as many Singapore stamps as Malaysian stamps. How many more Singapore stamps were added to his collections?**

**Answer **

**232 stamps**

**Q2) There are 1572 apples in Bag A and Bag B. The number of apples in Bag A is 1/2 the number of apples in Bag B. There are 150 more apples in Bag C than in Bag A. How many apples are there in Bag C?**

**Answer **

**674 apples**

**Q3)I have fewer than 30 marbles. I can put them equally into bags of 2, 4 or 7 without any remainder. How many marbles do I have?**

**Answer**

**28 marbles**

**Q4) Ricky and Mary had an equal number of stickers at first. After Rick gave away 155 stickers and Mary lost 15 stickers, Mary had 6 times as many stickers as Rick. How many stickers did Rick have in the end?**

**Answer**

**28**

**Q5) Dr Toh saw some patients on Monday. Every day from Tuesday to Wednesday, he saw 3 more patients than the day before. He saw a total of 78 patients from Monday to Wednesday. How many patients did he see on Monday?Answer**

** 23**

**Q6) Baoli has 12 lollipops. Nora has 9 lollipops.Rizal has 15 lollipops and Tina has 17 lollipops.Three children put their lollipops in an empty bag.There are 41 lollipops in an empty bag.Which three children put their lollipops in the bag?__________, __________ and __________ put their lollipops in the bag.**

**Answer**

** Nora, Rizal and Tina**

**Q7) There are some cars and 3 motorcycles at a carpark. There are 26 wheels altogether. How many cars are there?Ans: _____________**

**Answer**

** There are 5 cars.**

**Q8) There were 1 200 chairs in the hall. Mr Ang arranged them into 3 rows. There were 605 more chairs in the first row than the second row. The number of chairs in the second row was thrice the number of chairs in the third row. How many chairs were there in the second and third row?Ans: ________**

### Answer

** There were 340 chairs in the second and third rows.**

**Q9) Davis has 426 stamps. Peter has 200 fewer stamps than Davis. How many stamps do they have altogether? Which one of the following models is correct?**

**Answer **

**D**

**Q10) ****Weiling attended a piano recital. In the auditorium, she was led to the fourth row from the stage.**

**There were 5 seats to the right of Weiling and 8 seats to her left. Each row had an equal number of seats. If there were 18 rows behind her, how many seats were there in the auditorium?**

** **

**Ans: _______________**

**Answer**

** There were 308 seats in the auditorium.**

**Q11) Dave has 1/2 as many stamps as Tom. After Tom gave 85 stamps to Dave, they had the same number of stamps. How many stamps do they have altogether?Ans: ________ stamps**

**Answer**

** 510**

**Q12) ****Rita's marks for 4 subjects are shown below. ****The Maths and Science marks are covered by ink. ****She scored 17 more marks in Maths than in Science. ****How many marks did she score for Maths?**

** **

**Ans: ______________**

**Answer**

** 89**

**Q13) ****Janesse plans to wear a dress with a jacket and a pair of heels. How many different ways can she dress up if she has a blue dress, a red dress, a white jacket, a green jacket and 3 pairs of heels of different colours?**

** **

**Ans: __________________**

**Answer**

** 12**

**Q14) ****At a farm, the number of chickens is twice the number of cows. The number of ducks is thrice the number of chickens. After 90 ducks are sold, the number of ducks is the same as the number of cows.**

**How many animals are left in the farm?**

** **

**Ans: ___________________**

**Answer**

** 72 animals are left in the farm.**

**Q15) ****Some scouts were sitting in a circle around a campfire. They were evenly spaced out and numbered in order. The 3rd scout was sitting directly opposite the 11th scout. If 4 scouts were to leave the campfire, how many scouts were left?**

** **

**Ans: ________________ scouts**

**Answer**

** 12**

**Q16) ****There are two types of blouses, A and B, displayed for sale in a shop. Type A blouse has 4 buttons while Type B blouse has 5 buttons. Caitlin counted a total of 193 buttons on 42 blouses. How many blouses of each type are there?**

** **

**Ans: __________________ Type A blouses**

** **

** __________________ Type B blouses**

**Answer**

** There are 17 blouses of Type A and 25 blouses of Type B.**

**Q17) ****Chloe had an equal number of stickers and stamps. She gave 43 stickers to her friends and had twice as many stamps as stickers left. How many stickers and stamps did she have at first?**

** **

** **

**Ans: ______________**

**Answer**

**172**

**Q18) ****In City A, there are a total of 56 cinemas, 22 of the cinemas are newly-built while the rest are not. An old cinema has 298 fewer seats than a new cinema. A new cinema has 872 seats. What is the total number of seats in these 56 cinemas?**

** **

** **

**Ans: _____________________**

**Answer**

** There was a total of 38 700 seats in these 56 cinemas.**

**Q19) ****Joyce, Perry, Tanya and Seetha shared a box of stickers. After distributing all the stickers, Joyce got thrice as many stickers as Tanya. If Perry gave 38 stickers to Seetha, they would both have the same number of stickers. Perry would then have half as many stickers as Joyce. If there were 208 stickers in the box in the end, how many stickers did Joyce and Perry have respectively at first?**

** **

** **

**Ans: Joyce: ________________**

** Perry: ________________ **

**Answer**

** Joyce had 120 stickers at first while Perry had 98 stickers at first.**

**Q20) ****Kim and Judy had the same number of stickers at first. After Kim bought another 23 stickers and Judy lost 5 stickers, Kim had twice as many stickers as Judy. How many stickers did each of them have at first?**

** **

** **

**Ans: __________________**

**Answer**

** Both Kim and Judy has 33 stickers each at first.**