Here are six integer cards : You can pick any of these and make an expression Class 6

Here are six integer cards : You can pick any of these and make an expression Class 6

Question 1.

Here are six integer cards: Class 6

(+ 1), (+ 7), (+ 18), (- 5), (- 2), (- 9).

You can pick any of these and make an expression using addition(s) and subtraction(s).

Here is an expression : (+ 18) + (+ 1) - (+ 7) - (- 2) which gives a value (+ 14). Now, pick cards and make an expression such that its value is closer to (- 30).

Solution:

(-9) - (+18) + (-5) - (-2) - (+1) = -31.

Question 2.

The sum of two positive integers is always positive but a (positive integer) - (positive integer) can be positive or negative. What about Class 6

(a) (positive) - (negative)

(b) (positive) + (negative)

(c) (negative) + (negative)

(d) (negative) - (negative)

(e) (negative) - (positive)

(f) (negative) + (positive)

Solution:

(a) positive

(b) may be positive or negative

(c) negative

(d) may be positive or negative

(e) negative

(f) may be positive or negative

Question 3.

This string has a total of 100 tokens arranged in a particular pattern. What is the value of the string? Class 6

Solution:

Its value may be 1 positive +1 positive +1 positive = 3 positives.

But without knowing the actual value of each positive or negative, nothing can be said of the actual value of the string.