Question

Find the product by using into suitable property
(i) (69 x 59) x 20
[Hint : (69 x 59) x 20 = 69 x (59 x 20)]
(ii) (-4) x (-9) x (-10) (iii) 60 x (-10) x 2
(iv) 39 x 10 x (-5)​

Answer 1

i) (69 × 59) × 20 = 69 × (59 × 20)

= 4071 × 20 = 69 × 1180

= 81420 = 81420

ii) (-4 × -9) × -10 = -4 × (-9 × -10)

= 36 × -10 = -4 × 90

= -360 = -360

iii) (60 × -10) × 2 = 60 × (-10 × 2)

= -600 × 2 = 60 × -20

= -1200 = -1200

iv) (39 × 10) × -5 = 39 × (10 × -5)

= 390 × -5 = 39 × -50

= -1950 = -1950

This property is known as associative property ..

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