Squareroots & Cuberoots Model Questions Set 1 Practice Questions Answers Test with Solutions & More Shortcuts
Squareroots & Cuberoots PRACTICE TEST [1 - EXERCISES]
Squareroots & Cuberoots Model Questions Set 1
Question : 1
$√{450 +890 + 685}$ = ?
a) 45
b) 43
c) 55
d) 53
e) None of these
Answer »Answer: (a)
$√{450 + 890 + 685} = √{2025}$ = 45
Question : 2
$√54 × √2120 ÷ √460$ = ?
a) 140
b) 120
c) 160
d) 180
e) 200
Answer »Answer: (c)
73.86 × 46.04 ÷ 21.44 = ?
? = 74 × 46 ÷ 22
? = 154.7 ≈ 160
Question : 3
The smallest number by which 3888 must be divided so that the resulting number is a perfect square is
a) 6
b) 2
c) 3
d) None of these.
Answer »Answer: (c)
Resolving 3888 into its prime factors, we find that
3888=2×2×2×2×3×3×3×3×3
3888 = (2×2) × (2×2) × (3×3) × (3×3) ×3
Here we find that prime factor 3 is appearing alone.
So, if we divide 3888 by 3, we will get a perfect square number
Question : 4
$√{12 × 145 ÷ 6 + 34}$ = ?
a) $(324)^2$
b) – 18
c) 18
d) $√18$
e) None of these
Answer »Answer: (c)
Question : 5
1190 ÷ $√7225$ × ? = 3094 =
a) 121
b) 221
c) 214
d) 241
e) None of these
Answer »Answer: (b)
$1190/√{7225}$ ×? = 3094 = or, ${1190 × ?}/85$ = 3094
or, ? = ${3094 × 85}/1190$ = 221
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