Add brackets at appropriate places in the expressions such that they lead to the values indicated. Class 7

Add brackets at appropriate places in the expressions such that they lead to the values indicated. Class 7

Question 1.

Add brackets at appropriate places in the expressions such that they lead to the values indicated. Class 7

(a) 34 - 9 + 12 = 13

(b) 56 - 14 - 8 = 34

(c) -22 - 12 + 10 + 22 = - 22

Solution:

(a) 34 - (9 + 12) = 13

(b) 56 - (14 + 8) = 34

(c) -22 - (12 + 10 - 22) = -22

Question 2.

Using only reasoning of how terms change their values, fill the blanks to make the expressions on either side of the equality (=) equal. Class 7

(a) 423 + ______= 419 + ______

Solution:

423 + 15 = 419 + 19

(b) 207 – 68 = 210 – ______

Solution:

207 - 68 = 210 - 71

Question 3.

Using the numbers 2, 3 and 5, and the operators '+' and '-' and brackets, as necessary, generate expressions to give as many different values as possible. For example, 2 - 3 + 5 = 4 and 3 - (5 - 2) = 0. Class 7

Solution:

Do as directed. For example,

3 - (5 + 4) = -6.