Skip to content

Addition and Subtraction of Approximations – JSS1 Mathematics Lesson Note (Second Term)

Download Lesson Note

Lesson note at a glance

Subject: Mathematics
Class: JSS1
Term: Second Term
Topic: Addition and Subtraction of Approximations
Order: Topic 2 of 7 this term
Reading time: 1 min

Example 1: approximate the following to its accuracy, the degree of

a) 674 + 975 (3 s.f)
b) 805 + 912 (4s.f)
c) 3076 – 621 (2 s.f)
d) 728 – 97.979 (4 s.f)

Solutions:

a) 674 + 975 = 1649 (165 to 3 s.f.) Note that you must add the numbers before converting to the degree.
b) 805 + 912 = 1717 (1717 to 4s.f.)
c) 3076 – 621 = 2455 (250 to 2 s.f.)
d) 728 – 97.979 = 597.749 (597.7 to 4 s.f.)

EVALUATION:

Convert the following to their accuracy degree

42.4739 to 5 s.f
67.3258 to 3s.f
879.9087 to 4 s.f
304.385 to 5 s.f

This term's Mathematics topics

JSS1 Second Term · 7 topics

Approximation
Addition and Subtraction of Approximations
Number Base
Number System
Basic Operation
Addition & Subtraction of Directed Numbers
Algebra Process

Advertisement

Lesson Notes for Other Classes