# Reciprocals Questions and Answers - Form 2 Topical Mathematics

QUESTIONS

1. Use the reciprocal table to evaluate giving your answer to three significant figures.
10/ 0.8343/129.64
2. Find the reciprocals of the numbers 807 and 0.0591; Hence evaluate
5/807 + 4/0.0591
3. Use reciprocal tables to find the value of:

4. Find without using a calculator, the value of:

5. Use tables of cubes, cube roots and reciprocal to find the value of:-

6. Determine the value of a for which
1/127 + 1/11.5 = 1/a
Use mathematical tables only
7. Use tables of squares, square roots and reciprocals only to find the value of x correct to 4 significant figures:
8. Use reciprocal tables to find the value of
9. Use tables of reciprocals only to work out;
3/0.6735 + 13/0.156
10. Using tables of squares, cube roots and reciprocals find the value of x.
1/x = 1/0.00259¹/³ − 1/1.28²
11. Use reciprocal, square and square root tables to evaluate, to 4 significant figures, the expression

1. 10/0.834  − 3/129.64
(10 x 1.199) − (3 x 0.007713)
11.99 − 0.923139
11.966861
12.0
2. 807 → 0.001239
0.0591 → 16.92
5(0.001239) + 4(16.92)
= 67.69
3. ¹/³ {2 x 1.5065 + 5 x 1.2004}
¹/³ (3.013 + 6.002) (0.3333)
= 9.015 x 0.3333
= 3.005 (3 dp)
4.
5. 4/(8.68)³ + 5/34.46
4/653.97 + (0.1451)¹/³
4(0.1529) + 0.5255
0.6116 + 0.5255 = 1.1371
6. 1/a = 0.007874 + 0.0869
= 0.9483
a = 10.55

7. √3.87946 = √3.879
= 1.9695
= 1.970(4s.f)

8. 3x1.485 + 13x6.410
= 4.455 + 83.33
= 87.785

ALT
30/6.735 + 130/1.56 = 30 x 0.1485 + 130x0.641
= 4.455 + 83.33
= 87.785

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