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Mathematics for IGCSE & O level - Estimation (Section 4)

1
If a value in a calculation is given to the nearest tenth, the answer can not be more than?
Answer
(B)
To the nearest tenth
2
Which of the following is the best strategy for estimating the answer to a multiplication problem?
Answer
(B)
Round all numbers to 1 significant figure and then multiply.
3
Which digit is considered to determine how to round to 1 s.f.?
Answer
(A)
The second digit
4
What is 0.067 rounded to 1 s.f.?
Answer
(A)
0.06
5
What is the value of 0.005459 rounded to 3 significant figures?
Answer
(C)
0.0055
6
What is 0.127 rounded to 1 s.f.?
Answer
(A)
0.1
7
How many significant figures are in the number 0.00560?
Answer
(C)
3
8
Which digit do you look at to find the value of the decimal places?
Answer
(B)
Right side
9
What is the approximate area of a rectangle with a length of 7.8 cm and a width of 4.2 cm (rounded to 1 s.f.)?
Answer
(D)
36 cm²
10
What is 0.00546 to 2 significant figures?
Answer
(B)
0.0054
11
What is 0.00367 rounded to 2 s.f.?
Answer
(C)
0.0037