Samacheer Kalvi 8th Maths Guide Chapter 1 Numbers Ex 1.6
Samacheer Kalvi 8th Maths Guide Chapter 1 Numbers Ex 1.6
Tamilnadu Samacheer Kalvi 8th Maths Solutions Chapter 1 Numbers Ex 1.6
Question 1.
Fill in the blanks.
(i) (-1)even integer is __________ .
Answer:
1
(ii) For a ≠ 0, a0 is __________ .
Answer:
1
(iii) 4-3 × 5-3 = __________ .
Answer:
20-3
(iv) (-2)-7 is = __________ .
Answer:
−1/128
(iv) (2-5 × 27) ÷ 2-2
(2-5 × 27) ÷ 2-2 = (2-5 + 7) ÷ 2-2
= 22 ÷ 2-2
= 22+2
= 24
= 16
(v) (2-1 × 3-1) ÷ 6-2
(2-1 × 3-1) ÷ 6-2 = (2 × 3)-1 ÷ 6-2
= (6-1) ÷ 6-2
= 6(-1)-(-2)
= 61
= 6
Equating the powers of the same base 2.
x – 3 = 2
x – 3 + 3 = 2 + 3
x = 5
(v) If you fill a bucket with dirt, the portion of the whole Earth that is in the bucket will be 0.00000000000000000000000 16 kg
Answer:
Portion of earth in the bucket = 0.00000000000000000000000 16 kg
= 1.6 10 × 1024 kg.
Objective Type Questions
Question 11.
By what number should (-4)-1 be multiplied so that the product becomes 10-1?
Question 15.
0.0000000002020 in scientific form is __________ .
(A) 2.02 × 109
(B) 2.02 × 10-9
(C) 2.02 × 10-8
(D) 2.02 × 10-10
Answer:
(D) 2.02 × 10-10
Hint:
0.0000000002020
The Complete Educational Website