CBSE Class 7 Maths Arithmetic Expressions (Class 7 NCERT New) Quiz 17

1. Can you explain why this is happening using the Token Model of integers that we saw in the Class 6 textbook of mathematics? Thus, in an expression having two terms, swapping them does not change the value. Term 1 + Term 2 = Term 2 + Term 1

A Because the Token Model shows that swapping tokens does not change their total value. B Because the Token Model only works for subtraction. C Because the Token Model ignores the value of tokens. D Because the Token Model changes the value when terms are swapped.

2. Raghu bought 100 kg of rice from the wholesale market and packed them into 2 kg packets. He already had four 2 kg packets. Write an expression for the number of 2 kg packets of rice he has now and identify the terms.

A The terms are 4 and 100/2. B The terms are 2 and 100/4. C The terms are 100 and 2/4. D The terms are 4 and 2/100.

3. For each of the following situations, write the expression describing the situation, identify its terms and find the value of the expression. (a) Queen Alia gave 100 gold coins to Princess Elsa and 100 gold coins to Princess Anna last year. Princess Elsa used the coins to start a business and doubled her coins. Princess Anna bought jewellery and has only half of the coins left. Write an expression describing how many gold coins Princess Elsa and Princess Anna together have.

A Expression: (100 × 2) + (100 ÷ 2) = 200 + 50 = 250 B Expression: (100 × 2) + (100 × 2) = 200 + 200 = 400 C Expression: (100 ÷ 2) + (100 ÷ 2) = 50 + 50 = 100 D Expression: (100 × 2) + (100 × 1) = 200 + 100 = 300

4. A metro train ticket between two stations is ₹40 for an adult and ₹20 for a child. What is the total cost of tickets: (i) for four adults and three children?

A Expression: (4 × 40) + (3 × 20) = 160 + 60 = ₹220 B Expression: (4 × 40) + (3 × 40) = 160 + 120 = ₹280 C Expression: (4 × 20) + (3 × 40) = 80 + 120 = ₹200 D Expression: (4 × 20) + (3 × 20) = 80 + 60 = ₹140

5. A metro train ticket between two stations is ₹40 for an adult and ₹20 for a child. What is the total cost of tickets: (ii) for two groups having three adults each?

A Expression: 2 × (3 × 40) = 2 × 120 = ₹240 B Expression: 2 × (3 × 20) = 2 × 60 = ₹120 C Expression: 3 × (2 × 40) = 3 × 80 = ₹240 D Expression: 2 × (3 × 40) + 2 × (3 × 20) = ₹360

6. Find the total height of the window by writing an expression describing the relationship among the measurements shown in the picture.

A Total Height = Border + Grill + Gap = 3 cm + 2 cm + 5 cm = 10 cm B Total Height = Border + Grill = 3 cm + 2 cm = 5 cm C Total Height = Grill + Gap = 2 cm + 5 cm = 7 cm D Total Height = Border + Gap = 3 cm + 5 cm = 8 cm

7. What is the value of 500 – (250 – 100) without brackets?

A 350 B 250 C 400 D 150

8. Hira has a rare coin collection. She has 28 coins in one bag and 35 coins in another. She gifts her friend 10 coins from the second bag. Write an expression for the number of coins left with Hira.

A 28 + (35 – 10) B 28 + 35 + 10 C 28 – (35 – 10) D 28 + (35 + 10)

9. What happens to the value of an expression if we increase or decrease the value of one of its terms?

A The value of the expression changes accordingly. B The value of the expression remains the same. C The value of the expression becomes zero. D The value of the expression always increases.

10. Add brackets at appropriate places in the expressions such that they lead to the values indicated. (a) 34 – 9 + 12 = 13 (b) 56 – 14 – 8 = 34 (c) –22 – 12 + 10 + 22 = –22

A (a) 34 – (9 + 12) = 13 (b) 56 – (14 + 8) = 34 (c) (–22 – 12) + (10 + 22) = –22 B (a) (34 – 9) + 12 = 13 (b) 56 – (14 – 8) = 34 (c) –22 – (12 + 10) + 22 = –22 C (a) 34 – 9 + (12) = 13 (b) (56 – 14) – 8 = 34 (c) –22 – 12 + (10 + 22) = –22 D (a) (34 – 9 + 12) = 13 (b) 56 – 14 – (8) = 34 (c) –22 – (12 + 10 + 22) = –22