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Chapter 10: Exponents and Powers > Exercise 10.1

Exercise 10.1

1. Evaluate:

Instructions

(i) 3−2 = =
(ii) −4−2 = =
(iii) 12−5 = =
We have found all the answers.

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

Instructions

(i) −45÷−48
= −45−48 = =
(ii) 1232
= 12232 = =
(iii) −34 × 534
= −14×34×5434 = = × =
(iv) 3−7÷3−10×3−5
= 3−73−10 × 3−5 = × 3−5 = × 3−5
= × 3−5 = = =
(v) 2−3×−7−3 = = =

3. Find the value of:

Instructions

(i) 30+4−1 × 22 = + × 22
= × 22 = × 22
= 5×22−2 = × =
(ii) 2−1×4−1 ÷ 2−2
= ( × ) ÷
= 12×122 ÷ 1/4 = ÷ 14
= × =
(iii) 12−2+13−2+14−2
= + +
= + +
= + + = + + =
(iv) 3−1+4−1+5−10 =
(v) −23−22 = = =

4. Evaluate:

Instructions

(i) 8−1×532−4
We can write: 8 =
= 23−1×532−4 = ×
= × =
(ii) 5−1×2−1×6−1
= × ×
= 110 × 16 =

5. Find the value of m for which 5m÷5−3 = 55

Instructions

5m ÷ 5−3 = 55
= 55 i.e. = 55
Comparing exponents on both sides, we get: m + =
m = - =

6. Evaluate:

Instructions

(i) 13−1−14−1−1
= 311−411−1 = =
(ii) 58−7×85−4 = 5−78−7×8−45−4
= ×
= × = =

7. Simplify:

Instructions

(i) 25×t−45−3×10×t−8 (t ≠ 0)
We can express: 25 = and 10 = ×
= 52×t−45−3×5×2×t−8 = 52−−3−1×t−4−−82 = =
(ii) 3−5×10−5×1255−7×6−5
We can express: 125 = and 10−5 = ×
= 3−5×2−5×5−5×535−7×2−5×3−5
= 3−5−−5×2−5−−5×5−2−−7 = ( × × ) = × × =