21. Given expression = (12.1212 + 17.0005) -9.1102 = (29.1217 – 9.1102) = 20.0115.
22. Given expression = 892.7 – (573.07 +95.007) =892.7 – 668.077 = 224. 623.
23. Let 3889 + 12.952 – X = 3854.002.
Then X = (3889 + 12.952) – 3854.002 = 3901.952 – 3854. 002 = 47.95.
24. Let 138.009 + 341. 981 ) – 146.305=123.6 + X.
Then, X = (138.009 + 341.981) – (146.305 + 123.6)= 479.99 – 269.905 = 210.085.
25. Let 832.58 – 242.31 = 779.84 –X .
Then, X = (779.84 + 242.31) – 832.58 = 1022.15 – 832.58 = 189.57.
26. Let X + 542 + 5.43 = 603.26. then, X = 603.26 – (543 + 5.43 ) =603.26 – 548.43 = 54.83.
Missing digit = 8.
27. 3.14 x 10⁶ = 3.140000 x 1000000 = 3140000.
28. 518.000,000 = 5.18 x 100000000 = 5.18 x 10⁸.
29. 0.000006723 = 0.000006723 x 10⁶/10⁶ = 6.723 x 10⁻⁶.
30. 10 k = 0.001125/1.125 = 1.125/1125 = 1.125 x 10³/1125 x 10³ = 1/10³ = 10⁻³.
K=-3.
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