Significant Figures

1.  The number 1628 has 4 significant figures.

(a)  Round it to 3 sig. Figs (b) Round it to 2 sig. Figs.

2.  Round the following numbers to 3 sig. figs :-

(a)  4162 (b) 5077 (c) 9125 (d) 18 370

(e) 29849 (f) 17651 (g) 123 854 (h) 37 996

3.  Round the following to 2 sig. figs :-

(a)  578 (b) 964 (c) 2365 (d) 1722

4.  The crowd at a World Cup match was 92 847. Round this figure to :

(a) 4 sig. figs (b) 3 sig. figs (c) 2 sig. figs (d) 1 sig. fig

5.  To find an approximate answer to 379 x 2126, we could round each number to 1 sig. fig :-

ð  379 x 2126

≈ 400 x 2000 = 800 000 (approximate)

By rounding each number to 1 sig. fig, find an approximate answer to :-

(a)  187 x 196 (b) 315 x 409 (c) 4085 x 394

(d) 5998 ÷ 19 (e) 38 651 ÷ 211 (f) 7686 ÷ 2194

6.  How many significant figures does each number have here :-

(a)  0.123 (b) 0.01724 (c) 0.0006

(d) 0.050 (e) 0.2020 (f) 0.0110010

7.  Round each of the following to 2 sig. figs :-

(a)  0.137 (b) 0.896 (c) 0.05771 (d) 0.006031

8.  Round each of the following to 1 sig. fig :-

(a)  0.0781 (b) 0.93265 (c) 0.00473 (d) 0.00097

147000
Round 2347 to 3 significant figures. / 2350
Round 1.269 to 2 significant figures.
1.3
Round 186 to 1 significant figure. / 200
Round 2.0137 to 4 significant figures.
2.014
Round 368249 to 1 significant figure. / 400000
Round 0.00245 to 1 significant figure.
0.002
Round 0.0000058763 to 2 significant figures. / 0.0000059
Round 0.000030456 to 2 significant figures.
0.000030
Round 7.994 to 2 significant figures. / 8.0
Round 10.356 to 3 significant figures.
10.4
Round 0.08907654 to 1 significant figure. / 0.09
Round 89.98 to 3 significant figures.
90.0
The number 45678 has 5 significant figures. Round it to 1 significant figure. / 50000
Round 136000 to 2 significant figures.
140000
The number 78.97654 has 7 significant figures. Round it to 4 significant figures. / 78.98
How many significant figures does 0.0006 have?
1
Round 0.00097 to 1 significant figure. / 0.001
Round 23.0687 to 3 significant figures.
23.1
How many significant figures does 45.0987 have? / 6
How many significant figures does 0.00000102 have?
3
The number 0.000019 has 2 significant figures. Round it to 1 significant figure. / 0.00002
Round 140189 to 4 significant figures.
140200
The number 1.092 has 4 significant figures. Round it to 2 significant figures. / 1.1
Round 0.0186 to 2 significant figures.
0.019
Round 102 to 1 significant figure. / 100
Round 10.68 to 2 significant figures.
11
Round 0.00036945 to 3 significant figures. / 0.000369
Round 62.99 to 3 significant figures.
63.0
How many significant figures does 2.0003409 have? / 8
Round 0.20450 to 3 significant figures.
0.205
The number 0.0094 has 2 significant figures. Round it to 1 significant figure. / 0.009
Round 147300 to 3 significant figures.