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  1. Solve percent equations to find the amount
    by Dr. Osama M. Khaled — published Jul 18, 2024 — last modified Jul 18, 2024 08:08 PM — filed under: Year 7
    We translate the percent sentence into a percent equation and then find the unknown number
    Located in Mathematics / … / Percent / Solving Percent Problems Using Percent Equations and Proportions
  2. Use the subtraction rule
    by Dr. Osama M. Khaled — published Apr 29, 2026 — filed under: Year 7
    To subtract two integers, add the first integer to the opposite (additive inverse) of the integer to be subtracted.
    Located in Mathematics / … / Integers / Subtracting Integers
  3. The Moon and Gravity
    by Dr. Osama M. Khaled — published Mar 27, 2024 — last modified Jul 13, 2024 12:44 PM — filed under: Year 7
    The moon is 240,000 miles from earth-center, or 60 times as far as we are from center
    Located in Physics / Gravity
  4. Find the area of a polygon
    by Dr. Osama M. Khaled — published May 16, 2026 — last modified May 16, 2026 10:23 PM — filed under: Year 7, Year 8
    The area of a polygon is the measure of the amount of surface it encloses. Area is measured in square units, such as square inches or square centimeters
    Located in Mathematics / Geometry / Perimeters and Areas of Polygons
  5. Classification and Subsets of Numbers
    by Dr. Osama M. Khaled — published May 23, 2026 — last modified May 23, 2026 12:40 AM — filed under: Year 7, Year 8, Year 9, Year 10
    Whole Numbers, Integers, Rational, Irrational, and Real Numbers
    Located in Mathematics / Calculus / From Arithmetic to Algebra
  6. Properties and Theory of Integers
    by Dr. Osama M. Khaled — published May 23, 2026 — last modified May 23, 2026 05:02 AM — filed under: Year 7, Year 8
    Even/Odd Numbers, Factors, Prime Numbers, HCF, and LCM
    Located in Mathematics / Calculus / From Arithmetic to Algebra
  7. The Grammar and Language of Algebra
    by Dr. Osama M. Khaled — published May 23, 2026 — last modified May 23, 2026 05:12 AM — filed under: Year 7, Year 8
    Variables, Algebraic Thinking, and Algebraic Language
    Located in Mathematics / Calculus / From Arithmetic to Algebra
  8. Solve application problems by subtracting integers
    by Dr. Osama M. Khaled — published Apr 25, 2026 — last modified Apr 29, 2026 08:04 PM — filed under: Year 7
    Subtraction finds the difference between two numbers. When we find the difference between the maximum value and the minimum value of a collection of ...
    Located in Mathematics / … / Integers / Subtracting Integers
  9. Density
    by Dr. Osama M. Khaled — published Jul 25, 2024 — last modified Aug 11, 2024 02:26 AM — filed under: Year 7, Year 8
    Solids differ in many ways, including color, texture, and elasticity. Another important distinguishing property of solids is density
    Located in Physics / Solids
  10. Solve application problems by adding integers
    by Dr. Osama M. Khaled — published Dec 26, 2025 — last modified Feb 18, 2026 03:30 PM — filed under: Year 7
    There are many application problems that can be solved by adding integers. Here are few of them.
    Located in Mathematics / … / Integers / Adding Integers
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