Week 3 – Jss 1 Second Term Mathematics Lesson Notes

 
 WEEK 3:     ADDITION AND SUBTRACTION OF APPROXIMATIONS
Example 3.1: approximate the following to it accuracy of degree

1. 674 + 975 (3 s.f)
2. 805 + 912 (4s.f)
3. 3076 – 621 (2 s.f)
4. 695.728 – 97.979 (4 s.f)

Solutions:

1. 674 + 975 = 1649 (165 to 3 s.f.) note that you must add the numbers before converting to the degree.
2. 805 + 912 = 1717 (1717 to 4s.f.)
3. 3076 – 621 = 2455 (250 to 2 s.f.)
4. 695.728 – 97.979 = 597.749 (597.7 to 4 s.f.)

EVALUATION: Convert the following to their accuracy degree

1. 42.4739 to 5 s.f
   
2. 67.3258 to 3s.f
   
3. 879.9087 to 4 s.f
   
4. 304.385 to 5 s.f
   

 ASSIGNMENT:     ESSENTIAL MATHEMATICS BOOK 1
EXERCISE 8.7 NO 1 (g,h,I,j,k,l and m) PAGE 93
EXERCISE 8.8 NO 7,8 and 9 PAGE 95
EXERCISE 8.5 NO 1(D,E,F), NO 4 (B &C) N0 5 (A TO G) PAGE 89