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Practice Time 5E

1. Find the square root of the following.

(a) 36 (b) 225 (c) 14 25 (d) 2 1
81 324 36 4
.
2. Evaluate 50625 and find the value of 506 25. + 5 0625 .
3. Find the square root of the following decimal numbers.
(a) 51.84 (b) 0.5929 (c) 331.24 (d) 0.000625
4. Simplify.

59 29 − 529 23 04 − 256
.
.
.
.
(a) (b)
.
59 29 + 529 23 04 + 256
.
.
.
5. Find the value of the following.
.
(a) 25 6 × 529 (b) 1024 × 1849
.
6. Find the square root of 12.0068 up to three decimal places.
.
7. Given 2 = 1.414, 3 = 1.732, 5 = 2.236 and 7 = 2 646 , evaluate each of the following.
3
(a) 10 × 2 (b) 7 × 7 (c) 81 × 5 (d)
36
8. The square root of 2.9 up to two decimal places is ............... .
(a) 1.70 (b) 1.68 (c) 1.67 (d) none of these

Mental Maths

1. How many perfect squares are there between 100 and 1000?
2. How many natural numbers lie between 12 and 15 ?
2
2
3. Write the Pythagorean triplet whose one member is 15.
p
4. If 3p = 12 + 9 , then = ?
2
2
3
1
2
5. If area of a square is 12 cm , then what will be its perimeter?
4

Brain Sizzlers

1. Find 10 + 25 + 108 + 154 + 225 .

4 + 7
2. Find the value of correct up to 2 decimal places.
4 − 7

143 Squares and Square Roots