Rule of 72 Free Worksheet and Summary

 

The Rule of 72 is a simple trick to estimate how long it takes your money to double: just divide 72 by the interest rate.
Higher interest rates make your money double faster, and over time that creates huge differences in wealth.

Using a $5,000 investment:

At 4%, money doubles about every 18 years → about $10,000

At 8%, it doubles every 9 years → about $20,000 in the same time

At 12%, it doubles every 6 years → about $40,000 after about 18–20 years

The big lesson: small increases in interest rate lead to massive increases in long-term wealth—so making your money grow is far more powerful than just saving it. 💰

Rule of 72 Free Worksheet

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How to Read the Periodic Table - Free Worksheet

 

The periodic table is organized in a grid where elements are arranged by their atomic number, which is the number of protons in each atom. Each element has a box that shows important information, including its symbol, atomic number, and atomic (relative) mass.

The atomic number tells how many protons an element has. In a neutral atom, the number of electrons is the same as the number of protons. The atomic mass (rounded to a whole number) is used to find the number of neutrons by subtracting the atomic number from the mass number.

Each element’s color shows whether it is a metal, nonmetal, or metalloid, and whether it is a solid, liquid, or gas. The column (family or group) tells which elements have similar properties and the same number of valence electrons, and the row (period) shows how many energy levels the atom has.

The Periodic table is a wealth of information and a very helpful resource to be used in Chemistry

Worksheet Periodic Table

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Free Worksheet - How to find the Protons Neutrons and Electrons of an element on the Periodic table

 

The periodic table can be used to find an element’s name, symbol, atomic number, protons, neutrons, electrons, and mass number. 

Each element box shows important information. The symbol is a one- or two-letter abbreviation, and the atomic number tells how many protons an atom has. 

In a neutral atom, the number of electrons is the same as the atomic number. If an atom gains or loses electrons, it becomes an ion, but it is still the same element.

The atomic mass is a weighted average of all the element’s isotopes. When you round the atomic mass to the nearest whole number, you get the mass number. To find the number of neutrons, subtract the atomic number (protons) from the mass number.

Examples were shown using elements like silver, potassium, tin, and fluorine, where the atomic number was used to find protons and electrons, the atomic mass was rounded to find the mass number, and neutrons were found by subtracting protons from the mass number.

Free Worksheet Find Protons, Neutrons, Electrons

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How to identify METALS - NONMETALS - METALLOIDS on the PERIODIC TABLE / Free Worksheet

 

 On the periodic table, metals are found to the left of the zigzag staircase (except hydrogen). Metals are shiny, malleable, ductile, and good conductors.

Group 1 (alkali metals) are the most reactive metals.

Group 2 (alkaline earth metals) are shiny and reactive.

Transition metals (Groups 3–12) include many common metals.

Lanthanides and actinides are found at the bottom of the table.

Nonmetals are found to the right of the zigzag staircase. They are usually dull, brittle, and poor conductors.

Halogens (Group 17) are very reactive.

Noble gases (Group 18) are stable because their outer energy level is full.

Hydrogen is a nonmetal located on the left because it has only one valence electron.

Metalloids lie along the zigzag line and have properties of both metals and nonmetals. They are semiconductors and are used in technology, such as silicon in computer chips and germanium in solar panels.

Free Worksheet Metala and Nonmetals

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How to find the factors of a Number-plus Free Worksheet

 

1. Write the number you are finding the factors of at the top of your paper.

2. Start with 1 and the number itself.
   Write 1 × the number, because 1 is a factor of every number.

3. Leave space between the numbers so you can add more factor pairs as you go.

4.  Move inward by counting up from 2 and checking if it multiplies evenly into the number.

5. Each time you find a number that multiplies evenly, write the matching factor pair.

6.  Keep checking numbers in order, working inward from both sides.

7. Stop when you reach consecutive numbers (or when the numbers meet or cross).
   This means there are no more factors.

8.  Circle or list all the numbers you wrote.
   These are all the factors of the number.

Free Worksheet Finding Factors

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Divisibility Rules for Numbers 1-10 plus Worksheet

 

Divisibility rules help students quickly determine whether one number can be divided evenly by another without doing long division.

A number is divisible by 2 if it ends in 0, 2, 4, 6, or 8, which means it is an even number. 

A number is divisible by 3 if the sum of its digits is divisible by 3. 

For divisibility by 4, only the last two digits matter—if those digits are divisible by 4, the whole number is as well.

A number is divisible by 5 if it ends in 0 or 5. 

To be divisible by 6, a number must be divisible by both 2 and 3. 

A number is divisible by 9 when the sum of its digits is divisible by 9. For divisibility by 10, the rule is simple: the number must end in 0.

Finally, a number is divisible by 8 if the last three digits are divisible by 8 or if the number ends in three zeros. Using these rules allows students to quickly check divisibility and build strong number sense skills.

Divisibilty Rules Worksheet 1-10

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Earth Science Vocabulary - Core - Focus - Epicenter - Plate Boundary - Seismic Waves - Free Science Worksheet

 

This video explains key earthquake and Earth structure vocabulary. 

Seismic waves are energy waves that travel through the Earth during an earthquake. 

The focus, also called the hypocenter, is the underground point where an earthquake begins and energy is released. 

The epicenter is the spot on Earth’s surface directly above the focus and is usually where the strongest shaking occurs. 

A plate boundary is where tectonic plates meet, and most earthquakes happen in these areas. 

The core is the center of the Earth beneath the mantle, with a solid inner core and a liquid outer core, both made mostly of iron and nickel.

Free Earth Science Vocabulary Worksheet

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