Math 7, Lesson 3, Fall 2021, 9/26/2021

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Section 1:

1. Quiz on negative number, addition and subtraction of integers

2. Multiplication, division and combined operations of integers:.

3. Rational numbers: rational numbers are numbers that can be expressed in the form of a/b, where a and b are integers, and b != 0

4. Addition, subtraction, multiplication and division of rational numbers

5. Home Work:

  • Handout: three pages
  • Workbook:
    • page 8: 6, 8, 9, 10, 11
    • page 10: 18, 19, 20, 21, 22, 23

Section 2:

1. Quiz next week

2. Real numbers and use of calculators:.

  • Rational number: can be expressed as a decimal by dividing the numerator of the rational number by its denominator
  • Terminating decimal: has a finite number of digits: ⅜, 5/16
  • Repeating decimal: 9/11, 7/11
  • Irrational number: non-terminating and non-repeating decimals
  • Use of calculators

3. Rounding numbers to decimal places

  • Mark the cut-off point after the desired place value
  • Rule of rounding up: the first digit after the cut-off point,  is >=5
  • Rule of rounding don: the first digit after the cut-off point, is  < 5
  • Nearest 10, 100, 1000, one million, …
  • Nearest tenth, hundredth, or thousandth, …
  • 1 decimal place, two decimal places, 3 decimal places, …

4. Home Work:

  • Handout: two pages
  • Workbook:
    • page 11: 24, 25, 26, 27, 28, 29
    • page 12-13: 30, 31, 32, 33, 34, 35, 36