Pace Work. Math
Дата: 06.04.2020
Тема: Знаходження числа за відсотком
Зміст уроку: Розв'язання задач на знаходження числа за відсотком. Тренувальні вправи

1. Study the theory block

  How to calculate percentage of a number. Use the percentage formula: P% * X = Y
  1. Convert the problem to an equation using the percentage formula: P% * X = Y.
  2. P is 10%, X is 150, so the equation is 10% * 150 = Y.
  3. Convert 10% to a decimal by removing the percent sign and dividing by 100: 10/100 = 0.10.

You have learned that to find 1% of a number means finding 1/100 of it. Similarly, finding 60% of a number means finding 60/100 (or 6/10) of it.
In these expressions, the word “of” translates into multiplication:
1% of 90 → 1% × 90&
60% of $700 → 60% × $700.
We can also write those percentages as decimals:
1% of 90 → 0.01 × 90
60% of $700 → 0.6 × $700.

2. Do the tasks

- Use a calculator to find percentages of these quantities.
    a. 17% of $4500
    b. 67% of 27 m

- Use mental math to find percentages of these quantities.
    a. 25% of 240 mi

-  a. A lake has a 30-km long shoreline. 6% of it is sandy beach. What percentage of the shoreline is not sandy beach?

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