Integer Sums

When adding two numbers with different signs,...

• just add, keep the sign.

• find their difference.

When adding two numbers with the same sign,...

• just add, keep the sign.

• subtract and keep sign of larger number.

The sum, -999 + 1,277, is ...

• positive

• negative

• zero

The sum, -267 + -398, is...

• positive

• negative

• zero

10 + (-3) + 7 = ?

• -21

• 14

• 17

• impossible; you cannot add these

-9 + 8 + (-1) = ?

• -2

• 2

• 16

• -16

|-10 + 2| = ?

• -8

• 8

• 12

• -12

-999 + 999 = ?

• positive

• negative

• zero

• undefined

-11 + (-3 + -5) = ?

• -2

• 2

• -19

• 19

|-24| + |24| = ?

• 0

• -48

• 48

• 24