Try evaluating the following expressions by similarly drawing or imagining a suitable lift: Class 6

Try evaluating the following expressions by similarly drawing or imagining a suitable lift: Class 6

Question 1.

Try evaluating the following expressions by similarly drawing or imagining a suitable lift: Class 6

(a) - 125 + (- 30)

(b) + 105 - (- 55)

(c) + 105 + (+ 55)

(d) + 80 - (- 150)

(e) + 80 + (+ 150)

(f) - 99 - (- 200)

(g) - 99 + (+ 200)

(h) + 1500 - (- 1500)

Solution:

(a) -155

(b) +160

(c) +160

(d) + 230

(e) + 230

(f) +101

(g) +101

(h) + 3000

Question 2.

In the other exercises that you did above, did you notice that subtracting a negative number was the same as adding the corresponding positive number? Class 6

Take a look at the ‘infinite lift’ above. Does it remind you of a number line? In what ways?

Solution:

Yes, numbers marked on the lift looks like the same as marked on the number line.