BODMAS C8

Find the value of 60 – 10 + 20 – 30 + 40 – 20

Solution

Here we use BODMAS

There is only addition and subtraction, we add first before we can subtract.

= 60 – 10 + 20 – 30 + 40 – 20

= 60 + 20 + 40 – 10 – 30 – 20 (rearranging positives and negatives)

= 120 – 10 – 30 – 20    (dealing with positives first we get 120)

= 120 – 60    (then we add the negatives to get -60)

= 60    (then we get 60 after subtraction)

Hence 60 – 10 + 20 – 30 + 40 – 20 = 60