CBSE Class 7 Maths Arithmetic Expressions (Class 7 NCERT New) Quiz 18

1. Using only reasoning of how terms change their values, fill the blanks to make the expressions on either side of the equality (=) equal. (a) 423 + _____ = 419 + _____ (b) 207 – 68 = 210 – _____

A (a) 423 + (–4) = 419 + 0 (b) 207 – 68 = 210 – 71 B (a) 423 + 4 = 419 + 8 (b) 207 – 68 = 210 – 65 C (a) 423 + 0 = 419 + 4 (b) 207 – 68 = 210 – 68 D (a) 423 + (–4) = 419 + (–4) (b) 207 – 68 = 210 – 68

2. Using the numbers 2, 3 and 5, and the operators ‘+’ and ‘–’, and brackets, as necessary, how many different values can be generated?

A 6 B 4 C 5 D 3

3. Whenever Jasoda has to subtract 9 from a number, she subtracts 10 and adds 1 to it. For example, 36 – 9 = 26 + 1. (a) Do you think she always gets the correct answer? Why?

A Yes, she always gets the correct answer because subtracting 10 and adding 1 is the same as subtracting 9. B No, she sometimes gets the wrong answer because subtracting 10 and adding 1 is not always the same as subtracting 9. C She never gets the correct answer using this method. D She only gets the correct answer when the number is a multiple of 10.

4. Whenever Jasoda has to subtract 9 from a number, she subtracts 10 and adds 1 to it. For example, 36 – 9 = 26 + 1. (b) Which of the following is a similar strategy for subtracting 8 from a number?

A Subtract 10 and add 2 B Subtract 7 and add 1 C Subtract 9 and add 1 D Subtract 8 and add 2