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Chapter 10: Exponents and Powers > Exercise 10.1

Exercise 10.1

1. Evaluate:

Instructions

(i) 32 = =
(ii) 42 = =
(iii) 125 = =
We have found all the answers.

2. Simplify and express the result in power notation with positive exponent:

Instructions

(i) 45÷48
= 4548 = =
(ii) 1232
= 12232 = =
(iii) 34 × 534
= 14×34×5434 = = × =
(iv) 37÷310×35
= 37310 × 35 = × 35 = × 35
= × 35 = = =
(v) 23×73 = = =

3. Find the value of:

Instructions

(i) 30+41 × 22 = + × 22
= × 22 = × 22
= 5×222 = × =
(ii) 21×41 ÷ 22
= ( × ) ÷
= 12×122 ÷ 1/4 = ÷ 14
= × =
(iii) 122+132+142
= + +
= + +
= + + = + + =
(iv) 31+41+510 =
(v) 2322 = = =

4. Evaluate:

Instructions

(i) 81×5324
We can write: 8 =
= 231×5324 = ×
= × =
(ii) 51×21×61
= × ×
= 110 × 16 =

5. Find the value of m for which 5m÷53 = 55

Instructions

5m ÷ 53 = 55
= 55 i.e. = 55
Comparing exponents on both sides, we get: m + =
m = - =

6. Evaluate:

Instructions

(i) 1311411
= 3114111 = =
(ii) 587×854 = 5787×8454
= ×
= × = =

7. Simplify:

Instructions

(i) 25×t453×10×t8 (t ≠ 0)
We can express: 25 = and 10 = ×
= 52×t453×5×2×t8 = 5231×t482 = =
(ii) 35×105×12557×65
We can express: 125 = and 105 = ×
= 35×25×55×5357×25×35
= 355×255×527 = ( × × ) = × × =