ROUNDING OFF OF NUMBERS

Example: Round off 78539 to the nearest (a) ten   (b) Hundred   (c) thousand

Solution

• 78539  = 78540                 (b)       78500            (c)       79000

Decimal places

Example: Round off 567.5684 to the (a) nearest whole number (b) 1 d.p  (c) 2d.p  (d) 3 d.p

Solution

(a) 568        (b) 567.6                     (c)       567.57          (d)       567.568

Example 2: Round off 26.5274 to the nearest (a) tenth      (b) hundredth       (c) thousandth

Solution:

• 5 (b) 26.53       (c) 26.567

Significant figures (s.f)

Example: Round 0.0006729 to (a) 1sf  (b) 2s.f                       (C) 3 s.f

Solution

• 0007 (b)       0.00067                    (c)       0.000673