New Learning Composite Mathematics SK Gupta Anubhuti Gangal Class 8 Rational Numbers Practice 1D Solution
(1) State the property used by the following statements.
(a) -7/8 x 11/15 = 11/15 x -7/8
(b) 6/7 x 7/6 = 1
(c) -1/8 + 1/8 = 0
(d) -21/29 + 6/19 = 6/19 + (-21/29)
(e) -23/70 x 1 = -21/70
(f) 5/8 (1/2 – 1/3) = 5/8 x 1/2 – 5/8 x 1/3
(h) (1/2 x 1/3) x 1/5 = 1/2 x (1/3 x 1/5)
(2) Verify the following and state the property used.
(a) 17/135 x 15/-51 = 15/-51 x 17/135
(b) 1/9(18/5 -3/20) = 1/9 x 18/5 + 1/9 x (-3/20)
(c) (-1/2 + 3/7) + (-4/3) = -1/2 + [3/7 + (-4/3)]
(d) (5/3 x -4/5) x 3/5 = 5/3 x [(-4/5) x 3/5]
(e) -19/20 x 1 = 1 x (-19/20) = -19/20
(f) -17/24 x 24/-17 = 1
(g) -2/3 + 0 = 0 + (-2/3) = -2/3
(h) 1/7 + 0 = 0 + 1/7 = 1/7
(3) Taking, a = 4/7, b = -5/2 and c = 4/3, show that
a÷(b ÷ c) ≠ (a ÷ b) ÷ c, that is not associative for rational numbers.
SOLUTION Number 1, 2 & 3:
(4) Using distributivity, find (8/15 x (-7/18)) + (8/15 x -11/18)
(5) Find the additive inverse of each of the following.
(a) 5/16 (b) -15/-16 (c) -8/19 (d) 20/-23
(6) Write the multiplicatove inverse of each of the following.
(a) -7
(b) 10
(c) 17/41
(d) 28/-59
(e) -29/-36
(f) (1/3 – 1/4) x (-2)
(g) 5/8 ÷ 15/16 x (-3/2)
(h) 16 ÷ (-32)
SOLUTION Number 4, 5 & 6:
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More class answer
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In question 1, where is question h????
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Dear sir / mam have you makes a app for this or not