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Estimate: 40+20 = 60 Actual: 38+23 = 61
9.
estimate is to round up
1330 plus 900
1720
8000 + 3000 = 11000
8 + 11 = 19
79
86 + 40 = 126
6.3 + 1.5 = 7.8
The color of Mn2+ ion in estimation of iron 2 permanganometry is purple.
It is 3+3+4 = 10.
20 + 60 = 80
8 + 10 = 18
50*7 = 350