Question
Simplify:
(i)0.005×102−5×10−1
(ii)(25)2×7383×7
[4 MARKS]
(i)0.005×102−5×10−1
(ii)(25)2×7383×7
[4 MARKS]
Answer:
:
Each question: 2 Marks
i) It's easy to subtract powerswhen we convert theminto normal form.
0.005×102=0.5 (move the decimal point 2 places to the right)
5×10−1=0.5 (move the decimal point 1placeto the left)
Now,
0.005×102−5×10−1
=0.5−0.5
=0
ii)
(25)2×7383×7
= (25)2×7383×7
= (25×2)×73(23)3×7
= 210×7329×7
= 210−9×73−1=2×72
= 2×49=98
Was this answer helpful ?
:
Each question: 2 Marks
i) It's easy to subtract powerswhen we convert theminto normal form.
0.005×102=0.5 (move the decimal point 2 places to the right)
5×10−1=0.5 (move the decimal point 1placeto the left)
Now,
0.005×102−5×10−1
=0.5−0.5
=0
ii)
(25)2×7383×7
= (25)2×7383×7
= (25×2)×73(23)3×7
= 210×7329×7
= 210−9×73−1=2×72
= 2×49=98
Was this answer helpful ?
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