Page 53 - Mathematics

Example 3.11

Round off the following numbers.
(i) 1.88500 to two decimal places.
(ii) 2.682450 to four decimal places. Tanzania Institute of Education

Solution
(i) 1.88500 rounded off to two decimal places is 1.88 since the digits after

5 are all zero.
(ii) 2.682450 rounded off to four decimal places is 2.6824 as the digit after
5 is 0.

Example 3.12

(i) Round off 8.6521 to one decimal place.
(ii) Round off 81.26584 to two decimal places.

Solution

(i) 8.6521 is rounded off as 8.7 to one decimal place.
(ii) 81.26584 is rounded off as 81.27 to two decimal places.

Example 3.13

(i) Round 3.485 to two decimal places.
(ii) Round 0.65 to one decimal place.
(iii) Round 0.2465 to three decimal places.

Solution
Mathematics Form One
(i) 3.485 is rounded off as 3.48 to two decimal places.
(ii) 0.65 is rounded off as 0.6 to one decimal place.

(iii) 0.2465 is rounded off as 0.246 to three decimal places.

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25/10/2024 09:51:14
Mathematics form 1.indd 47
Mathematics form 1.indd 47 25/10/2024 09:51:14