What should be added to 712 to get −415 ?
(a) 1720
(b) −1720
(c) 720
(d) −720
−415−712=−16−3560=−5160=−51÷360÷3=−1720
What should be added to the sum of 37 and thrice of −67 to get 1713.
What should be added to 7 to get - 45 ?
What should be added to 6715 to get 815