What is (−7)×(−13)?
19 × (7 + 3 + 9 + 2)
19 × 10 + 11
19 × 7 + 19 × 3 + 19 × 9 + 19 × 2
19 × 10 + 19 × 11
Here, both the given integers are negative. Thus, their product will be positive. ∴(−7)×(−13)=+91
The additive inverse of −719 is: (a) −719 (b) 719 (c) 197 (d) −197
Without adding find the sum
(i) 1 + 3 + 5 + 7 + 9
(ii) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19
(iii) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23
Fill in the blanks.
(i) (−317)+(−125)=(−125)+(.....)
(ii) −9+−218=(......)+(−9)
(iii) (−813+37)+(−134)=(......)+[37+(−134)]
(iv) −12+(712+−911)=(−12+712)+(.....)
(v) 19−5+(−311+−78)={19−5+(.....)}+−78
(vi) −167+.....=......+−167=−167