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17.2 a) 999,955
18. 0,1818181
0,8181818
0,9999999
Above-mentioned are repetitive fractions
Rounded off, the answer is 1.
19.
a) 1
b) 3,3
c) 0,67
d) 4,3
e) 6,4
f) 2,7
g) 3,4
h) 1,25
i) 1,05
j) 6,7
k) 2,98
l) 1,12
m) 5
n) 8,6
o) 8,2
Leaner Section
17. ADDING AND SUBTRACTING OF DECIMAL FRACTIONS:
17.1 Do you still remember?
It is very easy to add and subtract decimal fractions. We do it in exactly
the same way that we would add and subtract whole numbers.
Just be certain that you write:
17.2 Calculate:
a) n = 284,523 + 715,432
b) d = 476,897 + 325,486
c) k = 532,298 – 416,549
d) b = 785,361 – 364,562
18. BRAIN-TEASER!
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19. Let us see how you do in the following mental test.
a) 0,6 + 0,4 = .................
b) 2,4 + 0,9 = .................
c) 0,27 + 0,4 = .................
d) 5 – 0,7 = .................
e) 3,8 + 2,6 = .................
f) 3,2 – 0,5 = .................
g) 3,45 – 0,05 = .................
h) 3,45 – 2,2 = .................
i) 3,45 – 2,4 = .................
j) 2,65 + 4,05 = .................
k) 4 – 1,02 = .................
l) 0,39 + 0,73 = .................
m) 3,25 + 1,75 = .................
n) 4,9 + 3,7 = .................
o) 12 – 3,8 = .................
MYMARKS |
IMPROVED |
GOT THE SAME RESULT |
DID WORSE |
Learning Outcome 1: The learner will be able to recognise, describe and represent numbers and their relationships, and to count, estimate, calculate and check with competence and confidence in solving problems.
Assessment Standard 1.7: We know this when the learner estimates and calculates by selecting and using operations appropriate to solving problems that involve:
1.7.4 addition, subtraction and multiplication of positive decimals to at least 2 decimal places.
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