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Applying Division

by Dr. Osama M. Khaled — published May 29, 2022 — last modified Jul 12, 2024 09:19 PM — filed under: Year 3, Year 4

Wondering how division can be used in real life? Take the quiz to know the answer. Division word problems

Located in Mathematics / Basic Arithmetic / Whole Numbers

Classify polygons

by Dr. Osama M. Khaled — published Oct 12, 2025 — last modified Oct 18, 2025 12:05 PM — filed under: Year 4

A polygon is a closed geometric figure with at least three line segments for its sides

Located in Mathematics / Geometry / Triangles

Classify triangles

by Dr. Osama M. Khaled — published Oct 16, 2025 — last modified Oct 18, 2025 12:06 PM — filed under: Year 4

A triangle is a polygon with three sides (and three vertices)

Located in Mathematics / Geometry / Triangles

Equivalent Fractions

by Dr. Osama M. Khaled — published Sep 15, 2023 — last modified Jul 12, 2024 09:35 PM — filed under: Year 4, Year 5

Fractions can look different but still represent the same part of a whole.

Located in Mathematics / … / Fractions and Mixed Numbers / Basics

Estimate sums of whole numbers

by Dr. Osama M. Khaled — published Jun 03, 2025 — last modified Jun 09, 2025 10:17 PM — filed under: Year 3, Year 4, Year 5

Estimation is used to find an approximate answer to a problem

Located in Mathematics / … / Whole Numbers / Adding Whole Numbers

Evaluate expressions involving addition and subtraction.

by Dr. Osama M. Khaled — published Nov 04, 2025 — last modified Nov 04, 2025 08:22 PM — filed under: Year 4

To evaluate (find the value of) expressions written in horizontal form that involve addition and subtraction, we perform the operations as they occur from left ...

Located in Mathematics / … / Whole Numbers / Subtracting Whole Numbers

Fractions that have the same denominator

by Dr. Osama M. Khaled — published Apr 26, 2024 — last modified Jul 12, 2024 09:46 PM — filed under: Year 4

Add and subtract fractions that have the same denominator

Located in Mathematics / … / Fractions and Mixed Numbers / Adding and Subtracting Fractions

Identify isosceles triangles

by Dr. Osama M. Khaled — published Oct 17, 2025 — last modified Oct 18, 2025 12:07 PM — filed under: Year 4

In an isosceles triangle, the angles opposite the sides of equal length are called base angles, the sides of equal length form the vertex angle, and the third ...

Located in Mathematics / Geometry / Triangles

Inequality