Aula 2 - números racionais, representação fracionária e decimal: operações e propriedades.

00:00 Rational numbers, fractional and decimal representation: operations and properties. 2:25 pM 2015) The fractional representation of the result of the operation 0.21875 − 0.15625 is 4:15 Addition and subtraction of decimal numbers 13:09 PM soldier 2019.2) Alfredo went to an electrical supplies store to buy some items. The table shows the quantity purchased of each item and its respective unit value. The total amount spent by Alfredo on this purchase was (A) R$ 80.00. (B) R$ 90.00. (C) R$ 92.80. (D) R$ 83.20. (E) R$ 87.50. 14:17 pM 2018) A store put 80 pieces of type A and 40 pieces of type B on sale, and after a week it had sold of the pieces of type A and of the pieces of type B. In relation to the total number of pieces put on sale, the number of pieces that were not sold that week represents 16:27 pM 2018.2) In a drawer there are 24 pens, of which some are green, some are red, and the rest are blue. The number of blue pens in this drawer is (A) 7. (B) 10. (C) 9. (D) 8. (E) 11. 17:59 pM 2017.2) In a room there were 120 candidates taking a test for a certain competition. After one hour from the start of the test, of the candidates left. After another hour, 6 candidates handed in their tests and also left, and the remaining candidates stayed until the established deadline. Regarding the initial number of candidates in the room, those who stayed until the established deadline correspond to 8:06 PM 2014) A company launched a 3.25-liter bottle of soda on the market. A family bought a 2-liter bottle of this soda and consumed — of the total during lunch. At dinner, — of what was still in the bottle was consumed. In relation to the total capacity of the bottle, the fraction that correctly represents the amount of soda that remained inside the bottle after dinner is 10:48 PM 2019) From her last salary, with a net value of R$ 2,748.00, Ana used it to pay her monthly obligations, and half of what remained she deposited in an investment she has. Knowing that one of the monthly obligations Ana paid was the electricity bill, which corresponded to 1/3 of the amount she deposited in the investment, the value of that electricity bill was Soldier of 25:18 pM 2019.2) João needs to paint a total of 48 wooden slats. On Friday, he painted "3" / "8" of this total, on Saturday, he painted "3" / "5" of the remaining slats, and on Sunday, he painted the rest, finishing the painting. In relation to the total number of wooden slats, those that were painted on Sunday correspond to the fraction (A) "1" / "8" (B) "1" / "3" (C) "1" / "4" (D) "1" / "5" (E) "1" / "6"