Question

Multiply:
(i) 15 by 9
(ii) 18 by −7
(iii) 29 by −11
(iv) −18 by 13
(v) −56 by 16
(vi) 32 by −21
(vii) −57 by 0
(viii) 0 by −31
(ix) −12 by −9
(x) −746 by −8
(xi) 118 by −7
(xii) −238 by −143

Answer 1

(i) 15 by 9
= 15 × 9
= 135

(ii) 18 by −7
= –(18 × 7)
= –126

(iii) 29 by –11
= –(29 × 11)
= –319

(iv) –18 by 13
= –(18 × 13)
= –234

(v) –56 by 16
= –(56 × 16)
= –896

(vi) 32 by –21
= –(32 × 21)
= –672

(vii) –57 by 0
= –(57 × 0)
= 0

(viii) 0 by –31
= –(0 × 31)
= 0

(ix) –12 by –9
= (–12) × (– 9)
= 108


(x) (–​746) by (–8)
= (–746) × (–8)
= 5968

(xi) 118 by −7
​= 118 × (-7)
= –826

(xii) −238 by −143
= (−238) × (−143)
= 34034