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Question

# Find each of the following products : (i) 35×−78 (ii) −92×54 (iii) −611×−53 (iv) −23×67 (v) −125×10−3 (vi) 25−9×3−10 (vii) 5−18×−920 (viii) −1315×−2526 (ix) 16−21×145 (x) −76×24 (xi) 724×(−48) (xii) −135×(−10)

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Solution

## (i) 35×−78=3×(−7)5×8=−2140 (ii) −92×54=−9×52×4=−458 (iii) −611×−53=−6×(−5)11×3=3033 =30÷333÷3=1011 (iv) −23×67=−2×63×7=−1221 =−12÷321÷3=−47 (v) −125×10−3 =−12×105×(−3)=−120−15=−120÷15−15÷15 =−8−1=81=8 (vi) 25−9×3−10 =25×3(−9)×(−10)=7590=75÷1590÷15=56 (vii) 5−18×−920 5×(−9)−18×20=−45−360=−45÷45−360÷45 =−1−8=18 (viii) −1315×−2526=−13×(−25)15×26=325390 =325÷65390÷65=56 (ix) 16−21×145=16×14−21×5=224−105 =224÷7−105÷7=32−15=−3215 (x) −76×24=−7×246=−7×4=−28 (xi) 724×(−48)=7×(−48)24 =7×(−2)=−14 (xii) −135×(−10)=−13×(−10)5 =−13×(−2)=26

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